Question

calculate the wavelength, frequency and wavenumber of a light whose 4×10^-8s.​

Answer 1

Here is ur answer:

$frequency = \frac{1}{period}$

$= \frac{1}{4 \times {10}^{ - 8} } = 2.5 \times {10}^{7} {s}^{ - 1}$

$= \frac{3 \times {10}^{8} }{2.5 \times {10}^{7} } = 12m$

$= \frac{1}{12} = 0.083 {m}^{ - 1}$

$= 8.3 \times {10}^{ - 2} {m}^{ - 1}$

Hope this will help you ❤

Answer 2

Answer:

frequency = 1 / time period

= 1 / 4 * 10⁼⁸

= 1/4 * 10⁸

= 0.25 * 10⁸

Speed of light = wavelength * frequency

wavelength = c / frequency ( c is speed of light in vacuum )

wavelength = 3*10⁸ / 0.25 * 10⁸

= 12

wave number = 1 / wavelength

= 1 / 12