Q. The frequency of light in air is $5 \times 10¹⁴\ Hz.$ What will be the frequency of light, when it enters in the water?
A) $2.5 \times 10¹⁴\ Hz$
B) $5 \times 10¹⁴\ Hz$
C) $10¹⁵\ Hz$
D) $2.5 \times 10¹²\ Hz$
Explanation
(b) When light enters from air or vacuum, $ie,$ when light goes from one medium to other, then its frequency does not change $ie,$ remains unchanged.
Hence, frequency of light will remain $5 \times 10^{14}\ Hz$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.