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Q.

What is the frequency of X-Rays if its frequency is 0.01 Angstrom?


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a

1 x 1020 Hz

b

3 x 1020 Hz

c

1 x 1018 Hz

d

3 x 1018 Hz 

answer is B.

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Detailed Solution

Concept- Based on our knowledge, the speed of light is equal to the speed of X-Rays that is equal to 3 x 108 m/s.
Now, we have to convert angstrom into meters.
We apply the equation v = f. (lambda)
Where, v is the speed of light
f is the frequency
Lambda is the wavelength.
Now, the wavelength is given to be 0.01 angstrom.
So, the frequency will be:
f=v/lambda  =3 x  10 8 /0.01 x  10 −10   =3 x  10 20 Hz.  
Hence, the correct option is 2.
 
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