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ARC-Easy / TIMSS_2007_8_pg57 / In a deep valley on Earth, a person shouting will hear an echo as the sound is…

Problem

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question

In a deep valley on Earth, a person shouting will hear an echo as the sound is reflected back off the surrounding mountains. In a similar valley on the Moon, no echo will be heard. This is because

choices

  • the gravitational pull on the Moon is too low
  • the temperature on the Moon is too low
  • there is no air on the Moon for the sound to travel through
  • the mountains on the Moon cannot reflect sound

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Source and history

Official source

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