Question

calculate the wave no. of a radiation with Frequency 4 x 10 raise to the power 4

Answer 1

Answer: 1.33 m^-1

Explanation:

Given that Frequency of radiation = 4 *10^14 Hz = 4 *10^4 s^-1

We know that required formula is:

Wave length = Speed / Frequency

Wave number = 1/Wavelength

Wave number = 1/Speed/Frequency

Therefore Wave number = Frequency / speed

Speed of light is 3 * 10^8 m/s

Wave number = 4 *10^4 / 3 * 10^8 = 1.34 * 10^-4 m^-1

Answer is 1.34 * 10^-4 metre inverse