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Class 12 Exam  >  Class 12 Questions  >  Which of the following electromagneticradiati... Start Learning for Free
Which of the following electromagneticradiations has the least wavelength? [2002]
  • a)
    gamma rays
  • b)
    infra-red
  • c)
    ultraviolet
  • d)
    X-rays
Correct answer is option 'A'. Can you explain this answer?
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Verified Answer
Which of the following electromagneticradiations has the least wavelen...
Gamma ray has highest frequency and lowest wavelength.
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Most Upvoted Answer
Which of the following electromagneticradiations has the least wavelen...
Understanding Electromagnetic Radiation
Electromagnetic radiation is categorized based on wavelength and frequency. The electromagnetic spectrum includes various types of radiation, each with distinct properties.
Wavelength and Frequency Relationship
- Wavelength is the distance between successive peaks of a wave.
- Frequency is the number of waves that pass a point in one second.
- The relationship is inversely proportional: shorter wavelengths have higher frequencies and vice versa.
Types of Electromagnetic Radiation
1. Gamma Rays
- These have the shortest wavelengths (less than 0.01 nanometers).
- High energy and high frequency.
- Commonly emitted by radioactive materials and cosmic sources.
2. X-rays
- Wavelengths range from about 0.01 to 10 nanometers.
- Used in medical imaging and industrial applications.
3. Ultraviolet (UV) Radiation
- Wavelengths vary from about 10 to 400 nanometers.
- Responsible for causing sunburns and has applications in sterilization.
4. Infrared Radiation
- Longer wavelengths ranging from about 700 nanometers to 1 millimeter.
- Mostly associated with heat and thermal imaging.
Conclusion: Why Gamma Rays Have the Least Wavelength
- Among the given options, gamma rays possess the shortest wavelengths.
- This places them at the high-energy end of the electromagnetic spectrum.
- Understanding this hierarchy helps in grasping the nature and applications of different types of radiation.
In summary, gamma rays, with their extremely short wavelengths, are the most energetic form of electromagnetic radiation, making them unique in their properties and applications.
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Read the following text and answer the following questions on the basis of the same:Laser:Electromagnetic radiation is a natural phenomenon found in almost all areas of daily life, from radio waves to sunlight to x-rays. Laser radiation – like all light – is also a form of electromagnetic radiation. Electromagnetic radiation that has a wavelength between 380 nm and 780 nm is visible to the human eye and is commonly referred to as light. At wavelengths longer than 780 nm, optical radiation is termed infrared (IR) and is invisible to the eye. At wavelengths shorter than 380 nm, optical radiation is termed ultraviolet (UV) and is also invisible to the eye. The term “laser light” refers to a much broader range of the electromagnetic spectrum that just the visible spectrum, anything between 150 nm up to 11000 nm (i.e. from the UV up to the far IR). The term laser is an acronym which stands for “light amplification by stimulated emission of radiation”.Einstein explained the stimulated emission. In an atom, electron may move to higher energy level by absorbing a photon. When the electron comes back to the lower energy level it releases the same photon. This is called spontaneous emission. This may also so happen that the excited electron absorbs another photon , releases two photons and returns to the lower energy state. This is known as stimulated emission.Laser emission is therefore a light emission whose energy is used, in lithotripsy, for targeting and ablating the stone inside human body organ.Apart from medical usage, laser is used for optical disk drive, printer, barcode reader etc.Q. Lithotripsy is

Read the following text and answer the following questions on the basis of the same:Laser:Electromagnetic radiation is a natural phenomenon found in almost all areas of daily life, from radio waves to sunlight to x-rays. Laser radiation – like all light – is also a form of electromagnetic radiation. Electromagnetic radiation that has a wavelength between 380 nm and 780 nm is visible to the human eye and is commonly referred to as light. At wavelengths longer than 780 nm, optical radiation is termed infrared (IR) and is invisible to the eye. At wavelengths shorter than 380 nm, optical radiation is termed ultraviolet (UV) and is also invisible to the eye. The term “laser light” refers to a much broader range of the electromagnetic spectrum that just the visible spectrum, anything between 150 nm up to 11000 nm (i.e. from the UV up to the far IR). The term laser is an acronym which stands for “light amplification by stimulated emission of radiation”.Einstein explained the stimulated emission. In an atom, electron may move to higher energy level by absorbing a photon. When the electron comes back to the lower energy level it releases the same photon. This is called spontaneous emission. This may also so happen that the excited electron absorbs another photon , releases two photons and returns to the lower energy state. This is known as stimulated emission.Laser emission is therefore a light emission whose energy is used, in lithotripsy, for targeting and ablating the stone inside human body organ.Apart from medical usage, laser is used for optical disk drive, printer, barcode reader etc.Q. What is the range of amplitude of LASER?

Read the following text and answer the following questions on the basis of the same:Laser:Electromagnetic radiation is a natural phenomenon found in almost all areas of daily life, from radio waves to sunlight to x-rays. Laser radiation – like all light – is also a form of electromagnetic radiation. Electromagnetic radiation that has a wavelength between 380 nm and 780 nm is visible to the human eye and is commonly referred to as light. At wavelengths longer than 780 nm, optical radiation is termed infrared (IR) and is invisible to the eye. At wavelengths shorter than 380 nm, optical radiation is termed ultraviolet (UV) and is also invisible to the eye. The term “laser light” refers to a much broader range of the electromagnetic spectrum that just the visible spectrum, anything between 150 nm up to 11000 nm (i.e. from the UV up to the far IR). The term laser is an acronym which stands for “light amplification by stimulated emission of radiation”.Einstein explained the stimulated emission. In an atom, electron may move to higher energy level by absorbing a photon. When the electron comes back to the lower energy level it releases the same photon. This is called spontaneous emission. This may also so happen that the excited electron absorbs another photon , releases two photons and returns to the lower energy state. This is known as stimulated emission.Laser emission is therefore a light emission whose energy is used, in lithotripsy, for targeting and ablating the stone inside human body organ.Apart from medical usage, laser is used for optical disk drive, printer, barcode reader etc.Q. LASER is used in

Which of the following electromagneticradiations has the least wavelength? [2002]a)gamma raysb)infra-redc)ultravioletd)X-raysCorrect answer is option 'A'. Can you explain this answer?
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