Question

(a) The time difference between seeing a flash of gun and hearing its sound is 4.2 s. If the
velocity of sound in air is 330 m/s, how far is the gun from the observer?
(b) Why can’t we hear echoes in small rooms?

Answer 1

$\huge{\mathcal{\purple{A}\green{N}\pink{S}\blue{W}\purple{E}\green{R}\pink{!}}}$

A flash of gun is mainly seen because of the reflection of the light followed by the light reception of the human eyes.

This indicates that the event actually seen was travelling with the speed of light which is 3 cross times 10 to the power of 8 .

time of seeing the flash = t

time at which the sound is heard = t+3

we know that

speed equals distance over time

distance equals speed space cross times space time

distance travelled by light of the flash = distance travelled by the sound wave ... (a hypothetical assumption for this numerical)

3 cross times 10 to the power of 8cross times space straight t=332 cross times left parenthesis straight t plus 3 right parenthesis

3 cross times 10 to the power of 8straight t minus 332 straight t=996

The above substraction in the LHS is quiet negligible, therefore it remains unchanged.

3 cross times 10 to the power of 8 straight t=996

straight t equals fraction numerator 996 over denominator 3 cross times 10 to the power of 8 end fraction

Distance of the gun from the observer = speed of light cross times space straight t

Therefore the distance of the gun from

btw this is alone king

DE ASIF

$\huge{\mathcal{\purple{Follo}\green{w}\pink{me}\blue{}\purple{}\green{}\pink{!}}}$

Answer 2

Answer:

This is the answer for part (a)