In a Hall

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In a Hall, a person receives direct sound waves from a source 120 m away. He also receives a wave from the same source which reaches him after being reflected from the 25 m high ceiling at a point halfway between them. The two waves interfere constructively for wavelengths (in meters)
15
Sep
In a Hall, a person receives direct sound waves from a source 120 m away. He also receives a wave from the same source which reaches him after being reflected from the 25 m high ceiling at a point halfway between them. The two waves interfere constructively for wavelengths (in meters) A thin plane membrane [...]
Posted in: Cengage NEET by C.P Singh , Chapter 17 - Sound Waves , Part 1 ,
Tags: A thin plane membrane separates hydrogen at 7 degree C from hydrogen at 47 degree C , both being at the same pressure. If a collimated sound beam travelling from the cooler gas makes an angle of incidence of 30 degree at the membrane , In a Hall , the angle of refraction is ,