Wavelength and Frequency Video Lessons

Concept: The Electromagnetic Spectrum

# Problem: What is the wavelength (in nm) of the light emitted by a bar code scanner that has a frequencyof 4.62 x 1014 s-1?a. 6.49 x 10-16 nmb. 6.49 x 10-7 nmc. 649 nmd. 1.39 x 1014 nme. 1.39 x 1023 nm

###### FREE Expert Solution

We are being asked to calculate the wavelength of the light emitted with a frequency equal to 4.62 x 1014 s-1.

Wavelength, frequency, and the speed of light are connected by the following equation:

$\overline{){\mathbf{c}}{\mathbf{=}}{\mathbf{\lambda \nu }}}$

c = speed of light, m/s
λ = wavelength, in m
ν = frequency, Hz (Hertz)

We can rearrange the equation to isolate the wavelength (λ):

###### Problem Details

What is the wavelength (in nm) of the light emitted by a bar code scanner that has a frequency
of 4.62 x 1014 s-1?

a. 6.49 x 10-16 nm
b. 6.49 x 10-7 nm
c. 649 nm
d. 1.39 x 1014 nm
e. 1.39 x 1023 nm