1.

The minimum distance of the reflector from the listener to hear the echo of monosyllabe sound is nearly equal to :

Answer»

16.5 m
33 m
66 m
330 m

Solution :A man can speak 5 syllable in 1 sec.
`therefore ` time to speak 1 syllable = `(1)/(5) `sec
Now,If d is the distance of REFLECTOR
` (2 d)/(v)= t`
`d = (vt)/(2) = (v)/(2) xx (1)/(5) = (300)/(10)`
` d = 33 m `
Hence the CORRET choice is (b).


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