Physicsmedium · Past Paper
The speed of sound in air is 340 m/s. A person shouts in front of a wall and hears an echo after 0.5 seconds. How far is the wall?
A170 m
B85 m
C340 m
D42.5 m
✓ Correct Answer: B — 85 m
d = (v * t) / 2 = (340 * 0.5) / 2 = 170 / 2 = 85 meters.
Share this question
More from Physics
- A 100W-220V bulb and a 60W-220V bulb are connected in series to a 220V supply. What is the total power consumed by the bulbs together?
- What is the relation between the mass of a body and its inertia?
- An ideal ammeter should have ________ resistance.
- The focal length of a lens depends on:
- What is the effect of increasing pressure on the speed of sound in an ideal gas at constant temperature?