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WAEC Physics 2023 Paper

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Question : 27

Total: 50

The range of wavelengths of the infrared waves in an electromagnetic spectrum is

10^{-3} \text{ m}

10^{-6} \text{ m}

. The wavelength of the radiation is

longer than $10^{-6} \text{ m}$ .
shorter than $10^{-6} \text{ m}$ .
shorter than $10^{3} \text{ m}$ .
longer than $10^{3} \text{ m}$ .

Solution:

The range of wavelengths for infrared waves is given as

10^{-3} \text{ m}

to

10^{-6} \text{ m}

. This means that the wavelength of the radiation is longer than

10^{-6} \text{ m}

but shorter than

10^{-3} \text{ ml}

. Therefore, the only correct option is that the wavelength is longer than

10^{-6} \text{ m}

.

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