Optics Question 1046

Question: The frequency of light ray having the wavelength 3000 Å is

[DPMT 2002]

Options:

A) 9 x 1013 cycles/sec

B) 1015 cycles/sec

C) 90 cycles/sec

D) 3000 cycles/sec

Show Answer

Answer:

Correct Answer: B

Solution:

$ \nu =\frac{c}{\lambda }=\frac{3\times 10^{8}}{3000\times {{10}^{-10}}}=10^{15} $ cycles/sec



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