A band of blue light has a velocity of 3.0 x 108

m/sec and a wavelength of 465 nanometers

(4.65 x 10? m). What is its frequency?

Answer: 6.4 x 10^14Hz

Explanation:

velocity of blue light (V) = 3.0 x 10^8m/sec

wavelength (λ) = 465 nanometers

(4.65 x 10? m)

Since 1nanometer = 1 x 10^-9 meter

465 nanometer = 4.65 x 10^-7 meters

frequency (F) = ?

Recall that the frequency of a wave is the number of cycles the wave complete in one second, and its unit is Hertz.

So, apply the formula V = F λ

3.0 x 10^8m/sec = F x 4.65 x 10^-7 meters

F = (3.0 x 10^8m/sec / 4.65 x 10^-7 meters)

F = 6.4 x 10^14Hz

Thus, the frequency of the blue light is 6.4 x 10^14Hz