Question

Calculate the frequency of visible light having a wavelength of 686 nm. (c = 3.00 × 108 m/s)

Answer 1

Given: Wavelength λ = 686 nm convert to meter λ = 6.86 x 10⁻⁷ m

Velocity of light c = 3.00 x 10⁸ m/s

Required: Frequency f = ?

Formula:   f = c/λ

                 f = (3.00 x 10⁸ m/s)/(6.86 x 10⁻⁷ m)

                 f = 4.37 x 10¹⁴ Hz or

                 f = 437 Terahertz 

Answer 2

Answer:

f=4.37×10¹⁴ Hz

Explanation:

Given data

λ =686nm=6.86×10⁻⁷m

c=3.00×10⁸ m/s

To find frequency

Solution

We can use the equation  

λ f = c

where

λ   is the wavelength of the wave, in meters

f  is the frequency of the wave hertz ( Hz )

c  is the speed of light

f=c/λ

f=3.00×10⁸/6.86×10⁻⁷

f=4.37×10¹⁴ Hz