Question

Sound waves of wavelength ???? travelling in a medium with a
speed of v m/ s enter into another medium where its speed
in 2v m/s. Wavelength of sound waves in the second
medium is
(a) ???? (b) ????/2
(c) 2????(d) 4????

Answer 1

Answer:

your question is unclear ...

Answer 2

Answer: 1/2

Explanation: Suppose wavelength in 1st medium is L1 and in 2nd medium is L2.

So frequency in 1st medium f1 = v*L1

and in 2nd medium f2 = 2vL2

When light travels from one medium into another, frequency remains the same, so

f1 = f2

or v*L1 = 2v*L2

or L1 = 2(L2)

ie L1 : L2 = 2 : 1

The answer is "wavelength/2"