Question

How do you calculate the frequency of red light?

Answer 1

Step 1: Given data

1. The wavelength of red light is $\lambda =700\times {10}^{-9}$ m.
2. The velocity of light in a vacuum is $c=3\times {10}^8$ m/s.

Step 2: Frequency

1. Red light is an electromagnetic wave.
2. Frequency is the number of complete waves produced in one second.
3. The frequency of light is defined as $f=\frac{c}{\lambda }$, where $c$and $\lambda$ are the velocity and wavelength of light in free space.

Step 3: Finding the frequency of red light

Now, we know that frequency, $f=\frac{c}{\lambda }$

So, the frequency of red light is $f=\frac{3\times {10}^8}{700\times {10}^{-9}}=4.28\times {10}^{14}Hertz.$

Therefore, the frequency of red light is 4.28 × 10¹⁴ hertz.