Which of the following statements is NOT true regarding infrared waves?
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A.
They are used in physical therapy.
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B.
These rays are also referred as heat waves.
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C.
They are help in maintaining the average temperature of the Earth.
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D.
They have wavelength much less than 700 nm.
Correct Answer:
D. They have wavelength much less than 700 nm.
Explanation:
The correct option is D. Infrared (IR) waves are electromagnetic radiation with wavelengths typically ranging from 700 nanometers (nm) to 1 millimeter (mm). Because the visible light spectrum ends at approximately 700 nm on the red side, infrared waves actually have wavelengths greater than 700 nm, not much less.
The other statements are accurate descriptions of infrared radiation: - They are used in physical therapy and heat lamps to treat muscle soreness because they can penetrate skin and generate warmth.
- They are commonly known as heat waves or thermal waves because they transmit thermal energy that we can feel as heat.
- They play a vital role in maintaining the Earth’s average temperature through the greenhouse effect, where greenhouse gases absorb infrared radiation emitted by the ground and trap it in the atmosphere.
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