Question

The values of Planck's constant is 6.63 × 10^–34 Js. The velocity of light is 3.0 × 10⁸ m s^–1. Which value is closest to the wavelength in nanometres of a quantum of light with frequency of 8 × 10¹⁵ s^–1?

(a) 5 × 10^–18 

(b) 4 × 10¹

(c) 3 × 10⁷ 

(d) 2 × 10^–25

Answer 1

Correct option: (b) 4 × 10¹

Explanation:

= 37.5 x 10^-9 m = 4 x 10¹ nm