Question

30. The refractive index of a material is 2.4, and the speed of sound in the material is
A. 1.25 x108m/s
B. 3x108 m/s
C. 7.2 x108 m/s
D. None of these

Answer 1

Answer:

A

1.25*108m/s

By definition value of refractive index = speed of light in air / speed of light in the medium

So,2.4=3× 10

8

/ speed of light in the medium

Or, Speed of light in the medium = 3×10

8

/2.4 = 1.25× 10

8