A cannon is fired from town X,after how long is the sound heard at a town Y 4.95 km away?



[velocity of sound in the air = 330 ms-1]

specxy

7 years ago

T*V = 2 * D
4.95km = 4950m
T = (2 * D) / V only if the sound comes back to the position X (echo), but because the sound is heard at a town Y which is 4950m away, the sound didnt come back to position X..
so T = D/V
ie. T = 4950m/330ms^-1
T = 15s..
option D is correct.

AbdallahKabeer

7 years ago

The answer should be 15s , remember there is no reflection of sound here, it will be a 30s if it is to be heard at town X, but at town Y ,means before reflection

Omoestah

4 years ago

There was no echo heard by the people of town X, so therefore, the answer is 15s

MichaelAugustine

6 years ago

The answer is 15m/s since there was no echo.

Olayinkaeducation

4 months ago

But actully the formula is V=2d/t, so the answer suppose to 30s