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The speeds of microwaves, infrared waves, and ultraviolet waves are Vm, Vi, and Vu respectively. Identify the correct combination showing the different waves in vacuum.
  • a)
    Vm > Vi > Vu
  • b)
    Vm = Vi = Vu
  • c)
    Vm < Vi < Vu
  • d)
    Vm > Vi < Vu
Correct answer is option 'B'. Can you explain this answer?
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Most Upvoted Answer
The speeds of microwaves, infrared waves, and ultraviolet waves are Vm...
The correct combination is ⇒ Vm = Vi = Vu. This is because, in vacuum, all the electromagnetic waves in question will travel at the same speed. The speed with which they travel in vacuum is the speed of light. (c = 3 × 108 m/s).
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Community Answer
The speeds of microwaves, infrared waves, and ultraviolet waves are Vm...
The correct combination showing the different waves in vacuum is:

a) Vm > Vi > Vu
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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,

The speeds of microwaves, infrared waves, and ultraviolet waves are Vm, Vi, and Vu respectively. Identify the correct combination showing the different waves in vacuum.a)Vm> Vi> Vub)Vm= Vi= Vuc)Vm< Vi< Vud)Vm> Vi< VuCorrect answer is option 'B'. Can you explain this answer?
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The speeds of microwaves, infrared waves, and ultraviolet waves are Vm, Vi, and Vu respectively. Identify the correct combination showing the different waves in vacuum.a)Vm> Vi> Vub)Vm= Vi= Vuc)Vm< Vi< Vud)Vm> Vi< VuCorrect answer is option 'B'. Can you explain this answer? for Class 12 2024 is part of Class 12 preparation. The Question and answers have been prepared according to the Class 12 exam syllabus. Information about The speeds of microwaves, infrared waves, and ultraviolet waves are Vm, Vi, and Vu respectively. Identify the correct combination showing the different waves in vacuum.a)Vm> Vi> Vub)Vm= Vi= Vuc)Vm< Vi< Vud)Vm> Vi< VuCorrect answer is option 'B'. Can you explain this answer? covers all topics & solutions for Class 12 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for The speeds of microwaves, infrared waves, and ultraviolet waves are Vm, Vi, and Vu respectively. Identify the correct combination showing the different waves in vacuum.a)Vm> Vi> Vub)Vm= Vi= Vuc)Vm< Vi< Vud)Vm> Vi< VuCorrect answer is option 'B'. Can you explain this answer?.
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