Question

A geologist is camped 7570 m (4.70 miles) from a volcano that erupts. How much time elapses before the geologist hears the sound from the eruption?

A) 4.70s B) 344s C) 22.0s

D) 0.014s E) 7570s

Answer 1

Answer on Question #47917, Physics, Mechanics | Kinematics | Dynamics

Question:

A geologist is camped 7570 m (4.70 miles) from a volcano that erupts. How much time elapses before the geologist hears the sound from the eruption?

A) 4.70s

B) 344s

C) 22.0s

D) 0.014s

E) 7570s

Answer:

Speed of sound in air equals $c = 340 \, \text{m/s}$. Therefore time elapses before the geologist hears the sound from the eruption:

$$t = \frac{d}{c}$$

where $d$ is distance to the volcano.

$$t = \frac{7570 \, \text{m}}{340 \, \frac{\text{m}}{\text{s}}} = 22 \, \text{s}$$

Answer: C) 22.0s

http://www.AssignmentExpert.com/