Question

The frequency of ultraviolet rays is:
$A)\text{ }{{10}^{14}}Hz$
$B)\text{ }{{10}^{4}}Hz$
$C)\text{ }{{10}^{8}}Hz$
$D)\text{ }{{10}^{10}}Hz$

Answer 1

Hint: This problem can be solved by recalling the electromagnetic spectrum which is the series of the electromagnetic radiations arranged in the order of increasing frequencies. Ultraviolet rays have a frequency greater than that of the visible light.

Complete step-by-step answer:
Ultraviolet rays are a band of electromagnetic radiation that have a frequency greater than the visible light region.
Ultraviolet rays (or UV rays) have an average frequency of ${{10}^{14}}Hz$.
Therefore, the correct answer is $A)\text{ }{{10}^{14}}Hz$.

Additional information:
Ultraviolet rays are used for many purposes including sanitization, killing germs and pathogens and for purification of drinking water.
Ultraviolet rays are present in the electromagnetic radiation emitted from the sun and overexposure to UV rays can potentially be very harmful for a human being. It can lead to various skin diseases like skin cancer and sunburns. The ozone layer in our atmosphere blocks out these ultraviolet rays and protects us. That is why the depletion of the ozone layer is a cause of major concern as in the absence of the ozone layer, we shall be completely exposed to the harmful effects of ultraviolet radiation.


Note: For solving such types of problems, it is imperative that students have the correct order of the electromagnetic spectrum in mind. An easy mnemonic to memorize the electromagnetic spectrum is:
“Raging Martians Invaded Venus Using X-ray Guns” where the underlined letter respectively stand for the electromagnetic radiations in increasing order of frequency , that is, Radio waves, Microwaves, Infrared waves (IR), Visible region, Ultraviolet rays (UV), X – rays and Gamma rays