Sound is said to travel in air at about 1100 feet per second. A man hears the…
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Sound is said to travel in air at about 1100 feet per second. A man hears the axe striking the tree, 11/5 seconds after he sees it strike the tree. How far is the man from the wood chopper?
Answer: B. 2420 ft — Key idea: Sound travels at about 1100 ft/s, and seeing the strike is effectively instantaneous compared with sound, so the delay is due to sound travel time.…
- A.
2310 ft
- B.
2420 ft
- C.
2550 ft
- D.
2629 ft
Attempted by 98 students.
Show answer & explanation
Correct answer: B
Key idea: Sound travels at about 1100 ft/s, and seeing the strike is effectively instantaneous compared with sound, so the delay is due to sound travel time.
Convert the time: 11/5 seconds = 2.2 seconds.
Compute distance = speed × time = 1100 ft/s × 2.2 s = 2420 ft.
Answer: 2420 feet.
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