Abhay Agarwal
from
St Francis School, Ghaziabad

Subject :NSO Class : Class 8

An echo repeats two syllables. A single syllable takes about 1/5^{th} of a second to utter. If the velocity of sound is 330 m s^{–1}, then the distance of the reflecting surface is

A 66.0 m

B 33.0 m

C 99.0 m

D 16.5 m

## Ans 1:

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Nilanjana De
from
Delhi Public School North, Bengaluru

Class : Class 8

Can someone please explain this question?

## Ans 2:

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## Ans 3:

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Bhramana Roy
from
Glendale Academy International, Hyderabad

Class : Class 8

Time taken to utter single syllable=1/5th of a sSpeed of sound in air=330m s^-1 or 330m/sso distance to reflecting surface=1/5 * 330 as that will give the distance=66.0mSo, distance to reflecting surface is 66.0m

## Ans 4:

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Prisha Hemchandra Lokhande
from
NPS Whitefield, Bangalore, Bangalore

Class : Class 8

Is the question wrong...? the answer should be 33.0 m as speed=2d/t

## Ans 5:

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Akhil Budithi
from
Kennedy high the global school , Hyderabad

Class : Class 8

please explain this question.

## Ans 7:

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Amol Athawale
from
WoodRidge High, aurangabad

Class : Class 6

answer??????????????????????????????????????????????????????

## Ans 8:

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vatsal jay gandhi
from
new era senior secondary school, Vadodara

Class : Class 8

please explain this question.