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Question
Rohan conducted experiments on echo in different media. He observed that a minimum distance of 'x' meters is required for the echo to be heard in oxygen and 'y' meters in benzene. Compare 'x' and 'y'. Justify your answer.
Speed of sound in oxygen: 340 ms-1
Speed of sound in benzene: 200 ms-1
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Solution
Since, d = `(vt)/2`
Where, d is the distance between the source of sound and the reflecting surface.
t be the time after which echo is heard
v is the speed of the sound
t = 0.1 sec for echo, It is constant for both
∴ d α v
Hence, `v_"oxygen"> v_"benzene"`
Hence, x > y
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