Travelling wave travels in medium '1' and enters into another medium '2' in which it's speed gets decreased to `25%`. Then magnitude of ratio of Amplitude of transmitted to rerflected wave is :

A progressive wave travels in a medium M_(1) and enters into another mediun M_(2) in which its speed decreases to 60% . Then the ratio of the amplitude of the transmitted and the incident waves is

A progressive wave travels in a medium M_(1) and enters into another mediun M_(2) in which its speed decreases to 60% . Then the ratio of the amplitude of the transmitted and the incident waves is

A progrssive wave travels in a medium M_(1) and enters into another medium M_(2) in which its speed decreased to 75% . What is the ratio of the amplitude of the (a). Reflected and the incident waves , and (b). Transmitted and the incident waves ?

When a wave travels from a denser to rarer medium, then

When a wave travels from a denser to rarer medium, then