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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:

Concept:

Infrared wavelengths lie between

10^{-6} \, \text{m}

and

10^{-3} \, \text{m}

.

Explanation:

The given range is from

10^{-6} \, \text{m}

to

10^{-3} \, \text{m}

.

So, the lower limit of this range is

10^{-6} \, \text{m}

.

Any wavelength in this range must be greater than

10^{-6} \, \text{m}

.

Also, it must be less than

10^{-3} \, \text{m}

.

Hence, the wavelength of infrared radiation is longer than

10^{-6} \, \text{m}

.

Answer:

A. longer than

10^{-6} \, \text{m}

.

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