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Class 12 Exam  >  Class 12 Questions  >  Which one of the following electromagneticrad... Start Learning for Free
Which one of the following electromagneticradiations has the smallest wavelength? [1994]
  • a)
    ultraviolet waves
  • b)
    X-rays
  • c)
    γ-rays
  • d)
    microwaves
Correct answer is option 'C'. Can you explain this answer?
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Verified Answer
Which one of the following electromagneticradiations has the smallest ...
Rays  -    Wavelength
[Range in m]
X-rays    -  1 × 10–11 to 3 × 10–8
γ-rays     -  6 × 10–14 to 1 × 10–11
Microwaves    -  10–3 to 0.3
Radiowaves    -  10 to 104
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Most Upvoted Answer
Which one of the following electromagneticradiations has the smallest ...
Understanding Electromagnetic Radiation
Electromagnetic radiation encompasses a wide range of waves characterized by their wavelengths and frequencies. The electromagnetic spectrum is typically divided into categories based on these properties, including radio waves, microwaves, infrared, visible light, ultraviolet, X-rays, and gamma rays.
Wavelengths of Different Types of Radiation
- Ultraviolet Waves:
- Wavelength range: approximately 10 nm to 400 nm.
- Used in sterilization and fluorescent lights.
- X-rays:
- Wavelength range: approximately 0.01 nm to 10 nm.
- Commonly used in medical imaging and security.
- Gamma Rays:
- Wavelength range: less than 0.01 nm (often in the picometer range).
- Emitted during nuclear reactions and certain astronomical events, with high energy.
- Microwaves:
- Wavelength range: approximately 1 mm to 1 m.
- Used in microwave ovens and radar technology.
Conclusion: Smallest Wavelength
Among the options provided, gamma rays possess the smallest wavelengths, making them the most energetic form of electromagnetic radiation. Their wavelengths are shorter than those of X-rays, ultraviolet waves, and microwaves. This high energy allows gamma rays to penetrate materials more effectively, which is why they are used in applications such as cancer treatment and sterilization of medical equipment.
In summary, the answer is option C: gamma rays have the smallest wavelength among the listed types of electromagnetic radiation.
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Read the following text and answer the following questions on the basis of the same:Microwave oven:The spectrum of electromagnetic radiation contains a part known as microwaves. These waves have frequency and energy smaller than visible light and wavelength larger than it. What is the principle of a microwave oven and how does it work ? Our objective is to cook food or warm it up. All food items such as fruit, vegetables, meat, cereals, etc., contain water as a constituent. Now, what does it mean when we say that a certain object has become warmer? When the temperature of a body rises, the energy of the random motion of atoms and molecules increases and the molecules travel or vibrate or rotate with higher energies. The frequency of rotation of water molecules is about 2.45 gigahertz (GHz). If water receives microwaves of this frequency, its molecules absorb this radiation, which is equivalent to heating up water. These molecules share this energy with neighbouring food molecules, heating up the food. One should use porcelain vessels and non metal containers in a microwave oven because of the danger of getting a shock from accumulated electric charges. Metals may also melt from heating. The porcelain container remains unaffected and cool, because its large molecules vibrate and rotate with much smaller frequencies, and thus cannot absorb microwaves. Hence, they do not get eaten up. Thus, the basic principle of a microwave oven is to generate microwave radiation of appropriate frequency in the working space of the oven where we keep food. This way energy is not wasted in heating up the vessel. In the conventional heating method, the vessel on the burner gets heated first and then the food inside gets heated because of transfer of energy from the vessel. In the microwave oven, on the other hand, energy is directly delivered to water molecules which are shared by the entire food.Q. In the microwave oven,

Read the following text and answer the following questions on the basis of the same:Microwave oven:The spectrum of electromagnetic radiation contains a part known as microwaves. These waves have frequency and energy smaller than visible light and wavelength larger than it. What is the principle of a microwave oven and how does it work ? Our objective is to cook food or warm it up. All food items such as fruit, vegetables, meat, cereals, etc., contain water as a constituent. Now, what does it mean when we say that a certain object has become warmer? When the temperature of a body rises, the energy of the random motion of atoms and molecules increases and the molecules travel or vibrate or rotate with higher energies. The frequency of rotation of water molecules is about 2.45 gigahertz (GHz). If water receives microwaves of this frequency, its molecules absorb this radiation, which is equivalent to heating up water. These molecules share this energy with neighbouring food molecules, heating up the food. One should use porcelain vessels and non metal containers in a microwave oven because of the danger of getting a shock from accumulated electric charges. Metals may also melt from heating. The porcelain container remains unaffected and cool, because its large molecules vibrate and rotate with much smaller frequencies, and thus cannot absorb microwaves. Hence, they do not get eaten up. Thus, the basic principle of a microwave oven is to generate microwave radiation of appropriate frequency in the working space of the oven where we keep food. This way energy is not wasted in heating up the vessel. In the conventional heating method, the vessel on the burner gets heated first and then the food inside gets heated because of transfer of energy from the vessel. In the microwave oven, on the other hand, energy is directly delivered to water molecules which are shared by the entire food.Q. As compared to visible light microwave has frequency and energy

Read the following text and answer the following questions on the basis of the same:Microwave oven:The spectrum of electromagnetic radiation contains a part known as microwaves. These waves have frequency and energy smaller than visible light and wavelength larger than it. What is the principle of a microwave oven and how does it work ? Our objective is to cook food or warm it up. All food items such as fruit, vegetables, meat, cereals, etc., contain water as a constituent. Now, what does it mean when we say that a certain object has become warmer? When the temperature of a body rises, the energy of the random motion of atoms and molecules increases and the molecules travel or vibrate or rotate with higher energies. The frequency of rotation of water molecules is about 2.45 gigahertz (GHz). If water receives microwaves of this frequency, its molecules absorb this radiation, which is equivalent to heating up water. These molecules share this energy with neighbouring food molecules, heating up the food. One should use porcelain vessels and non metal containers in a microwave oven because of the danger of getting a shock from accumulated electric charges. Metals may also melt from heating. The porcelain container remains unaffected and cool, because its large molecules vibrate and rotate with much smaller frequencies, and thus cannot absorb microwaves. Hence, they do not get eaten up. Thus, the basic principle of a microwave oven is to generate microwave radiation of appropriate frequency in the working space of the oven where we keep food. This way energy is not wasted in heating up the vessel. In the conventional heating method, the vessel on the burner gets heated first and then the food inside gets heated because of transfer of energy from the vessel. In the microwave oven, on the other hand, energy is directly delivered to water molecules which are shared by the entire food.Q. The frequency of rotation of water molecules is about

Which one of the following electromagneticradiations has the smallest wavelength? [1994]a)ultraviolet wavesb)X-raysc)γ-raysd)microwavesCorrect answer is option 'C'. Can you explain this answer?
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Which one of the following electromagneticradiations has the smallest wavelength? [1994]a)ultraviolet wavesb)X-raysc)γ-raysd)microwavesCorrect answer is option 'C'. Can you explain this answer? for Class 12 2025 is part of Class 12 preparation. The Question and answers have been prepared according to the Class 12 exam syllabus. Information about Which one of the following electromagneticradiations has the smallest wavelength? [1994]a)ultraviolet wavesb)X-raysc)γ-raysd)microwavesCorrect answer is option 'C'. Can you explain this answer? covers all topics & solutions for Class 12 2025 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Which one of the following electromagneticradiations has the smallest wavelength? [1994]a)ultraviolet wavesb)X-raysc)γ-raysd)microwavesCorrect answer is option 'C'. Can you explain this answer?.
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