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The photoelectric effect is a phenomenon that has led to many important scientific discoveries. Light of a particular wavelength is shined onto a piece of metal, showering the metal with photons. Wavelength is inversely related to a photon's energy. That is, with a smaller wavelength, the photon has greater energy. The wavelength of the light is decreased until a detector next to the metal senses that electrons are being ejected from the metal. This sensor also tells us how many electrons are ejected per second, which we call electrical current. At this point, any additional decrease in wavelength does not affect the number of electrons ejected. This point is called the metal's work function. However, if we then begin to increase the intensity of the light being shone (meaning the amount of light as opposed to the light's wavelength), the number of electrons picked up by the sensor increases. 
Q. Light intensity can best be described as which of the following?
  • a)
    The energy of photons of a light source
  • b)
    The number of photons being emitted by a light source
  • c)
    The color of light used
  • d)
    The speed at which photons of a light source travel
Correct answer is option 'B'. Can you explain this answer?
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The photoelectric effect is a phenomenon that has led to many importan...
The correct answer is the number of photons. In the passage, we are told that the intensity of a light is related to the amount of light used. As light can be quantified in terms of photons, we know that this means that more intensity implies more photons. Any answer related to energy (including wavelength, force, and color) are incorrect because energy does not directly affect number of photons emitted and the speed of light is always the same.
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The photoelectric effect is a phenomenon that has led to many important scientific discoveries. Light of a particular wavelength is shined onto a piece of metal, showering the metal with photons. Wavelength is inversely related to a photons energy. That is, with a smaller wavelength, the photon has greater energy. The wavelength of the light is decreased until a detector next to the metal senses that electrons are being ejected from the metal. This sensor also tells us how many electrons are ejected per second, which we call electrical current. At this point, any additional decrease in wavelength does not affect the number of electrons ejected. This point is called the metals work function. However, if we then begin to increase the intensity of the light being shone (meaning the amount of light as opposed to the lights wavelength), the number of electrons picked up by the sensor increases.Q. Based on the information in the passage, the term "work function" can be most accurately described as which of the following?

The photoelectric effect is a phenomenon that has led to many important scientific discoveries. Light of a particular wavelength is shined onto a piece of metal, showering the metal with photons. Wavelength is inversely related to a photons energy. That is, with a smaller wavelength, the photon has greater energy. The wavelength of the light is decreased until a detector next to the metal senses that electrons are being ejected from the metal. This sensor also tells us how many electrons are ejected per second, which we call electrical current. At this point, any additional decrease in wavelength does not affect the number of electrons ejected. This point is called the metals work function. However, if we then begin to increase the intensity of the light being shone (meaning the amount of light as opposed to the lights wavelength), the number of electrons picked up by the sensor increases.Q. According to the information in the passage, what can we infer would happen if the intensity of the light were decreased immediately after reaching the work function?

Directions: Read the passages and choose the best answer to each question.PassageThe photoelectric effect is the emission of electrons from matter upon the absorption of electromagnetic radiation, such as ultraviolet radiation or X-rays. Electromagnetic radiation is made up of photons, which can be considered finite packets of energy at various levels. Photons have properties attributed to both particles and waves. This phenomenon is known as the wave-particle duality.The photoelectric effect is especially noticeable when dealing with metals. When a metallic surface is exposed to electromagnetic radiation that is above the minimum energy threshold (which is specific to the type of surface and material), photons are absorbed and electrons are emitted. No electrons are emitted for radiation with energy frequencies below that of the threshold, as the electrons are unable to gain sufficient energy to overcome the attractive forces within the metal. A scientist wishing to measure the photoelectric effect so as to further understand the nature of photons conducted the following experiments.Experiment 1Wishing to measure the energy required to produce the photoelectric effect on a surface of a sheet of copper, the scientist directed a beam of radiation at different frequencies (energies)—measured in Hertz (Hz)—onto the surface.After 5 minutes, the charge—measured in volts (V)—of the sheet of metal was recorded. This was done because if electrons were emitted from the surface, the metal would take on a positive charge. The results were recorded in Table 1.Experiment 2Solar cells used to generate electricity are based on the concept of the photoelectric effect; however, the goal of the cell is to capture the emitted electron and create an electric current. The scientist measured the effects of different frequencies (in Hz) of radiation on the current (in V) generated by a certain solar cell. The results were recorded in Table 2.Q.Do the results of the experiments help to explain the nature of photons as finite packets of energy at various levels?

Directions: Read the passages and choose the best answer to each question.PassageThe photoelectric effect is the emission of electrons from matter upon the absorption of electromagnetic radiation, such as ultraviolet radiation or X-rays. Electromagnetic radiation is made up of photons, which can be considered finite packets of energy at various levels. Photons have properties attributed to both particles and waves. This phenomenon is known as the wave-particle duality.The photoelectric effect is especially noticeable when dealing with metals. When a metallic surface is exposed to electromagnetic radiation that is above the minimum energy threshold (which is specific to the type of surface and material), photons are absorbed and electrons are emitted. No electrons are emitted for radiation with energy frequencies below that of the threshold, as the electrons are unable to gain sufficient energy to overcome the attractive forces within the metal. A scientist wishing to measure the photoelectric effect so as to further understand the nature of photons conducted the following experiments.Experiment 1Wishing to measure the energy required to produce the photoelectric effect on a surface of a sheet of copper, the scientist directed a beam of radiation at different frequencies (energies)—measured in Hertz (Hz)—onto the surface.After 5 minutes, the charge—measured in volts (V)—of the sheet of metal was recorded. This was done because if electrons were emitted from the surface, the metal would take on a positive charge. The results were recorded in Table 1.Experiment 2Solar cells used to generate electricity are based on the concept of the photoelectric effect; however, the goal of the cell is to capture the emitted electron and create an electric current. The scientist measured the effects of different frequencies (in Hz) of radiation on the current (in V) generated by a certain solar cell. The results were recorded in Table 2.Q.A scientist predicts that in years to come the earth’s atmosphere will become much less effective at shielding the surface from radiation of higher frequencies. If this prediction is correct, which of the following is most likely to happen based on results of the experiments?

Directions: Read the passages and choose the best answer to each question.PassageThe photoelectric effect is the emission of electrons from matter upon the absorption of electromagnetic radiation, such as ultraviolet radiation or X-rays. Electromagnetic radiation is made up of photons, which can be considered finite packets of energy at various levels. Photons have properties attributed to both particles and waves. This phenomenon is known as the wave-particle duality.The photoelectric effect is especially noticeable when dealing with metals. When a metallic surface is exposed to electromagnetic radiation that is above the minimum energy threshold (which is specific to the type of surface and material), photons are absorbed and electrons are emitted. No electrons are emitted for radiation with energy frequencies below that of the threshold, as the electrons are unable to gain sufficient energy to overcome the attractive forces within the metal. A scientist wishing to measure the photoelectric effect so as to further understand the nature of photons conducted the following experiments.Experiment 1Wishing to measure the energy required to produce the photoelectric effect on a surface of a sheet of copper, the scientist directed a beam of radiation at different frequencies (energies)—measured in Hertz (Hz)—onto the surface.After 5 minutes, the charge—measured in volts (V)—of the sheet of metal was recorded. This was done because if electrons were emitted from the surface, the metal would take on a positive charge. The results were recorded in Table 1.Experiment 2Solar cells used to generate electricity are based on the concept of the photoelectric effect; however, the goal of the cell is to capture the emitted electron and create an electric current. The scientist measured the effects of different frequencies (in Hz) of radiation on the current (in V) generated by a certain solar cell. The results were recorded in Table 2.Q.Which of the following procedures would result in the most accurate values for the effect of frequency of radiation on the photoelectric effect (Experiment 1)?

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The photoelectric effect is a phenomenon that has led to many important scientific discoveries. Light of a particular wavelength is shined onto a piece of metal, showering the metal with photons. Wavelength is inversely related to a photons energy. That is, with a smaller wavelength, the photon has greater energy. The wavelength of the light is decreased until a detector next to the metal senses that electrons are being ejected from the metal. This sensor also tells us how many electrons are ejected per second, which we call electrical current. At this point, any additional decrease in wavelength does not affect the number of electrons ejected. This point is called the metals work function. However, if we then begin to increase the intensity of the light being shone (meaning the amount of light as opposed to the lights wavelength), the number of electrons picked up by the sensor increases.Q. Light intensity can best be described as which of the following?a)The energy of photons of a light sourceb)The number of photons being emitted by a light sourcec)The color of light usedd)The speed at which photons of a light source travelCorrect answer is option 'B'. Can you explain this answer?
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The photoelectric effect is a phenomenon that has led to many important scientific discoveries. Light of a particular wavelength is shined onto a piece of metal, showering the metal with photons. Wavelength is inversely related to a photons energy. That is, with a smaller wavelength, the photon has greater energy. The wavelength of the light is decreased until a detector next to the metal senses that electrons are being ejected from the metal. This sensor also tells us how many electrons are ejected per second, which we call electrical current. At this point, any additional decrease in wavelength does not affect the number of electrons ejected. This point is called the metals work function. However, if we then begin to increase the intensity of the light being shone (meaning the amount of light as opposed to the lights wavelength), the number of electrons picked up by the sensor increases.Q. Light intensity can best be described as which of the following?a)The energy of photons of a light sourceb)The number of photons being emitted by a light sourcec)The color of light usedd)The speed at which photons of a light source travelCorrect answer is option 'B'. Can you explain this answer? for ACT 2025 is part of ACT preparation. The Question and answers have been prepared according to the ACT exam syllabus. Information about The photoelectric effect is a phenomenon that has led to many important scientific discoveries. Light of a particular wavelength is shined onto a piece of metal, showering the metal with photons. Wavelength is inversely related to a photons energy. That is, with a smaller wavelength, the photon has greater energy. The wavelength of the light is decreased until a detector next to the metal senses that electrons are being ejected from the metal. This sensor also tells us how many electrons are ejected per second, which we call electrical current. At this point, any additional decrease in wavelength does not affect the number of electrons ejected. This point is called the metals work function. However, if we then begin to increase the intensity of the light being shone (meaning the amount of light as opposed to the lights wavelength), the number of electrons picked up by the sensor increases.Q. Light intensity can best be described as which of the following?a)The energy of photons of a light sourceb)The number of photons being emitted by a light sourcec)The color of light usedd)The speed at which photons of a light source travelCorrect answer is option 'B'. Can you explain this answer? covers all topics & solutions for ACT 2025 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for The photoelectric effect is a phenomenon that has led to many important scientific discoveries. Light of a particular wavelength is shined onto a piece of metal, showering the metal with photons. Wavelength is inversely related to a photons energy. That is, with a smaller wavelength, the photon has greater energy. The wavelength of the light is decreased until a detector next to the metal senses that electrons are being ejected from the metal. This sensor also tells us how many electrons are ejected per second, which we call electrical current. At this point, any additional decrease in wavelength does not affect the number of electrons ejected. This point is called the metals work function. However, if we then begin to increase the intensity of the light being shone (meaning the amount of light as opposed to the lights wavelength), the number of electrons picked up by the sensor increases.Q. Light intensity can best be described as which of the following?a)The energy of photons of a light sourceb)The number of photons being emitted by a light sourcec)The color of light usedd)The speed at which photons of a light source travelCorrect answer is option 'B'. Can you explain this answer?.
Solutions for The photoelectric effect is a phenomenon that has led to many important scientific discoveries. Light of a particular wavelength is shined onto a piece of metal, showering the metal with photons. Wavelength is inversely related to a photons energy. That is, with a smaller wavelength, the photon has greater energy. The wavelength of the light is decreased until a detector next to the metal senses that electrons are being ejected from the metal. This sensor also tells us how many electrons are ejected per second, which we call electrical current. At this point, any additional decrease in wavelength does not affect the number of electrons ejected. This point is called the metals work function. However, if we then begin to increase the intensity of the light being shone (meaning the amount of light as opposed to the lights wavelength), the number of electrons picked up by the sensor increases.Q. Light intensity can best be described as which of the following?a)The energy of photons of a light sourceb)The number of photons being emitted by a light sourcec)The color of light usedd)The speed at which photons of a light source travelCorrect answer is option 'B'. Can you explain this answer? in English & in Hindi are available as part of our courses for ACT. Download more important topics, notes, lectures and mock test series for ACT Exam by signing up for free.
Here you can find the meaning of The photoelectric effect is a phenomenon that has led to many important scientific discoveries. Light of a particular wavelength is shined onto a piece of metal, showering the metal with photons. Wavelength is inversely related to a photons energy. That is, with a smaller wavelength, the photon has greater energy. The wavelength of the light is decreased until a detector next to the metal senses that electrons are being ejected from the metal. This sensor also tells us how many electrons are ejected per second, which we call electrical current. At this point, any additional decrease in wavelength does not affect the number of electrons ejected. This point is called the metals work function. However, if we then begin to increase the intensity of the light being shone (meaning the amount of light as opposed to the lights wavelength), the number of electrons picked up by the sensor increases.Q. Light intensity can best be described as which of the following?a)The energy of photons of a light sourceb)The number of photons being emitted by a light sourcec)The color of light usedd)The speed at which photons of a light source travelCorrect answer is option 'B'. Can you explain this answer? defined & explained in the simplest way possible. Besides giving the explanation of The photoelectric effect is a phenomenon that has led to many important scientific discoveries. Light of a particular wavelength is shined onto a piece of metal, showering the metal with photons. Wavelength is inversely related to a photons energy. That is, with a smaller wavelength, the photon has greater energy. The wavelength of the light is decreased until a detector next to the metal senses that electrons are being ejected from the metal. This sensor also tells us how many electrons are ejected per second, which we call electrical current. At this point, any additional decrease in wavelength does not affect the number of electrons ejected. This point is called the metals work function. However, if we then begin to increase the intensity of the light being shone (meaning the amount of light as opposed to the lights wavelength), the number of electrons picked up by the sensor increases.Q. Light intensity can best be described as which of the following?a)The energy of photons of a light sourceb)The number of photons being emitted by a light sourcec)The color of light usedd)The speed at which photons of a light source travelCorrect answer is option 'B'. Can you explain this answer?, a detailed solution for The photoelectric effect is a phenomenon that has led to many important scientific discoveries. Light of a particular wavelength is shined onto a piece of metal, showering the metal with photons. Wavelength is inversely related to a photons energy. That is, with a smaller wavelength, the photon has greater energy. The wavelength of the light is decreased until a detector next to the metal senses that electrons are being ejected from the metal. This sensor also tells us how many electrons are ejected per second, which we call electrical current. At this point, any additional decrease in wavelength does not affect the number of electrons ejected. This point is called the metals work function. However, if we then begin to increase the intensity of the light being shone (meaning the amount of light as opposed to the lights wavelength), the number of electrons picked up by the sensor increases.Q. Light intensity can best be described as which of the following?a)The energy of photons of a light sourceb)The number of photons being emitted by a light sourcec)The color of light usedd)The speed at which photons of a light source travelCorrect answer is option 'B'. Can you explain this answer? has been provided alongside types of The photoelectric effect is a phenomenon that has led to many important scientific discoveries. Light of a particular wavelength is shined onto a piece of metal, showering the metal with photons. Wavelength is inversely related to a photons energy. That is, with a smaller wavelength, the photon has greater energy. The wavelength of the light is decreased until a detector next to the metal senses that electrons are being ejected from the metal. This sensor also tells us how many electrons are ejected per second, which we call electrical current. At this point, any additional decrease in wavelength does not affect the number of electrons ejected. This point is called the metals work function. However, if we then begin to increase the intensity of the light being shone (meaning the amount of light as opposed to the lights wavelength), the number of electrons picked up by the sensor increases.Q. Light intensity can best be described as which of the following?a)The energy of photons of a light sourceb)The number of photons being emitted by a light sourcec)The color of light usedd)The speed at which photons of a light source travelCorrect answer is option 'B'. Can you explain this answer? theory, EduRev gives you an ample number of questions to practice The photoelectric effect is a phenomenon that has led to many important scientific discoveries. Light of a particular wavelength is shined onto a piece of metal, showering the metal with photons. Wavelength is inversely related to a photons energy. That is, with a smaller wavelength, the photon has greater energy. The wavelength of the light is decreased until a detector next to the metal senses that electrons are being ejected from the metal. This sensor also tells us how many electrons are ejected per second, which we call electrical current. At this point, any additional decrease in wavelength does not affect the number of electrons ejected. This point is called the metals work function. However, if we then begin to increase the intensity of the light being shone (meaning the amount of light as opposed to the lights wavelength), the number of electrons picked up by the sensor increases.Q. Light intensity can best be described as which of the following?a)The energy of photons of a light sourceb)The number of photons being emitted by a light sourcec)The color of light usedd)The speed at which photons of a light source travelCorrect answer is option 'B'. Can you explain this answer? tests, examples and also practice ACT tests.
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