Light is a form of electromagnetic radiation. Which of the following statements about light wave is NOT true?

It has a varying amplitude

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It cannot pass through vacuum

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Its wavelength can vary

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It can pass through vacuum

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Solution

The correct option is B
It cannot pass through vacuum

Seven different constituent colours of visible light has a different wavelength, hence the wavelength of light varies.
The amplitude of a light wave tells us about the intensity or brightness of the light relative to other light waves of the same wavelength and hence can vary. Light from the sun can reach to us, it implies light can travel in vacuum.
Therefore, the only statement which is not true is that light cannot travel in a vacuum.

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Light is a form of electromagnetic radiation. Which statement about light waves is NOT true?

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