Question

Calculate the wave length (), frequency (), and wave number () of a light wave whose period (t) is 2.0 x 10-10s.Given velocity of light, c = 3.0 x 108 ms-1

Answer 1

Explanation:

given:

$t = 2.0 \times {10}^{ - 10} s$

$c = 3.0 \times {10}^{8} \frac{m}{s}$

solution:

$since \: υ (frequeny)= \frac{1}{t} \\ = \frac{1}{2.0 \times {10}^{ - 10} } \\ = 5 \times {10}^{9} hz \\ since \: wave \: number = \frac{υ}{c} \\ = \frac{5 \times {10}^{9} }{3 \times {10}^{8} } \\ = 1.67\times 10 {m}^{ - 1}$