Question

Wave length of light wave is 20mm hence frequency is

A. 1.5x 109 HZ
B. 1.5 x 1010 HZ
C. 2 x 1010 HZ
D. 2 x 109Hz​

Answer 1

Answer:we know that,

C=frequency×wavelength

3×10^8=frequency×20×10-³

Frequency=1.5×10^10

Explanation:

Hope it helps you