Question

A person fires a gun in front of high-rise building 167 m away. If the velocity of sound is 339 ms⁻¹, the time for hearing echo, after the firing of gun is:

Options

• 1.00 s

• 1.05 s

• 0.95 s

• 1.10 s

Answer 1

1.00 s

Explanation:

Total distance = 2 × d

= 2 × 167

= 334 m

Time taken (t) = `(2d)/v`

= `334/339`

≈ 0.985 s

Rounding 0.985 s to two decimal places gives 1.00 s.