Multiple choice

In which of the following phases of his mission to Moon could Neil Armstrong not hear any sound except for the sound produced by his headset?

  1. When he was training for weightless conditions submerged below the water surface in a water tank

  2. When he was training for the mission in high altitude test flights in very rarified atmosphere

  3. When he was actually travelling in the Saturn V rocket in space

  4. When he was walking on the surface of Moon
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Sound is a mechanical wave and needs a material medium like air, water, steel, etc. for its propagation, i.e. it cannot travel through vacuum. Thus, Neil Armstrong would not have been able to hear any sound except for his communication with mission control through his headset when he was walking on the surface of Moon as Moon has no atmosphere.

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