Light from a red laser pointer has a speed of 3.0×108 m/s and has a wavelength of 6.5×10−7 m . What is the frequency of this light?

Question

asked Mar 24, 2021 79.2k views

2 Answers

Guillaume Slashy · Answer 1 · 2021-03-25T09:37:44+0000

Answer: Light from a red laser pointer has a speed of 3.0×108 m/s and has a wavelength of 6.5×10−7 m . What is the frequency of this light?

Explanation: 4.61 x 10¹⁴ Hz

Mariola · Answer 2 · 2021-03-28T07:42:07+0000

Step-by-step explanation:

We have equation for speed of electromagnetic wave,

c = fλ

Where

f is the frequency and λ is the wavelength.

Here

c = 3.0×10⁸ m/s

λ = 6.5×10⁻⁷ m

Substituting in c = fλ

3.0×10⁸ = f x 6.5×10⁻⁷

f = 4.61 x 10¹⁴ Hz

The frequency of this light is 4.61 x 10¹⁴ Hz