<p>Electromagnetic waves with wavelengths A, B, C, and D are used for different purposes:</p>

<p>(a) A is used to treat muscular strain.<br />
(b) B is used by an FM radio station for broadcasting.<br />
(c) C is used to detect fractures in bones.<br />
(d) D is absorbed by the ozone layer of the atmosphere.</p>

<p>(I) dentify the region of the electromagnetic spectrum to which each wavelength belongs. (2 Marks)</p>

<p>(II) Arrange the wavelengths in decreasing order of magnitude. (1 Mark)</p>

<p>(III) Explain why wavelength D is absorbed by the ozone layer. (2 Marks)</p>