Question

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?

Answer 1

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

Answer 2

The frequency of this light is 4.61 x 10¹⁴ Hz

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