Chapter U5.114, Problem 2E

Interpretation Introduction

Interpretation:

The frequency $f$ of a wave needs to be determined.

Concept introduction:

Wavelength of wave is the distance between 2 successive crests.

And, the frequency is the number of times wave passed through a fixed point in 1 sec.

Answer to Problem 2E

$\text{frequency= }\frac{\text{speed of light}}{\text{Wavelength }}$

Explanation of Solution

Wavelength can be calculated using the following formula:

$\text{Wavelength = }\frac{\text{speed of light}}{\text{frequency}}$

Thus,

$\text{frequency= }\frac{\text{speed of light}}{\text{Wavelength }}$

The symbol for frequency is $f$.

So,

$f=\frac{c}{\lambda }$

Wavelength usually is expressed in units of meters and speed of light is m/s thus, the unit of frequency will be per second.