Question

Calculate the frequency of yellow light of wavelength 750 nm.

Answer 1

frequency=speed/wavelength
f=3*10^8/750
f=4*10^4

Answer 2

The speed of light in air is :

3.0 × 10⁸ m/s

ω (wavelength), f(frequency), C(speed of light)

f = C/ω

Convert wavelength to meters.

1nm = 0.000000001 meters

750nm =?

750 × 0.000000001 =7.5 ×10⁻⁷meters.

f = 3.0 × 10⁸ / 7.5 × 10⁻⁷ = 4 × 10¹⁴ Hz