If a light wave has a wavelength of 500nm in air what is the frequency of the wave? [c = 3 x 10^8 ms-1]

A. 3.0 x 10¹⁴ Hz
B. 6.0 x 10¹⁴ Hz
C. 6.0 x 10¹² Hz
D. 2.5 x 10¹⁴ Hz

Correct Answer:

Option B – 6.0 x 10¹⁴ Hz

Explanation

f = c/λ
∴ f = c/λ = 3 x 10⁸λ / 500 x 10⁹

=6.0 x 10¹⁴ Hz