Question

calculate the frequency of the wave number of radiation of wavelength 5,000 armstrong ?​

Answer 1

Explanation:

As we know that

velocity = frequency × wavelength

frequency = C(velocity) / wavelength

$= \frac{3 \times {10}^{8} }{5000 \times {10}^{ - 10} } \\ \\ = \frac{30 \times {10}^{7} }{5 \times {10}^{ - 7} } \\ \\ = 6 \times {10}^{14} {sec}^{ - 1}$

Now using

$\boxed{\underline{\bold{\mathsf{\overline{v} = \frac{1}{wavelength} }}}}$

$= \frac{1}{5000 \times {10}^{ - 10} } \\ \\ = \frac{ {10}^{7} }{5} \\ \\ = \frac{10 \times {10}^{6} }{5} \\ \\ 2 \times {10}^{6} {m}^{ - 1}$