Question

Neon lights emit an orange-red colored
glow. This light has a wavelength of 670 nm.
What is the frequency of this light?
We know that cru2
Therefore c/2=v and solve.​

Answer 1

Given:

Wavelength of the neon light = 670 nm

To find:

Frequency of the neon light.

Solution:

We know that λf = c

Where λ is the wavelength of light in meters,

f is the frequency of the light in Hertz,

c is the speed of light in m/s

We know that 1 meter = 10⁹ nm

Therefore 670 nm = 6.7 * 10⁻⁷

And c = 299792458 m/s

Therefore f = c/λ

f = 299792458 / 6.7*10⁻⁷

f = 44745143 * 10⁷

On rounding off to two significant figures we get f = 4.5 * 10¹⁴ Hertz

Therefore, the frequency of this light is 4.5* 10¹⁴ Hertz.