Can you hear me?

Classical Mechanics Level 2

In outer space, astronauts cannot have a conversation without the aid of communications equipment, as illustrated in [A] above. However, if they contact their helmets, then they can talk to each other as shown in [B]. Given this fact, which of the following statements is true?

a) There is no atmosphere in outer space.

b) A sound wave can propagate through solid matter, too.

c) No wave can propagate in a vacuum.

a) only a) and b) b) and c) c) only

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Lakshan Dumpa by Lakshan Dumpa , 24, India

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2 solutions

Palak Srivastava
Mar 16, 2014

b. is wrong as light or electromagnetic wave can travel in vaccum

4 Helpful 0 Interesting 0 Brilliant 0 Confused

Electromagnetic waves can travel in vacuum so b) is wrong

Vedant Mittal - 7 years, 2 months ago

a) is true because there is no sufficient air in outer space so there is no atmospehere there b) is also true because sound waves travel through vibrations and vibrations travel in solid matter c) is false because LIGHT wave can travel in a vaccuum.

thats what I know

0 Helpful 0 Interesting 0 Brilliant 0 Confused

a) & c) are true, because in outer of a planet, there is no an air to conducts the sound wave... And the atmosphere also supported of the soundwave in the air. That's my opinion...

Mochamad Faldy Rizky Yanvendra - 7 years, 2 months ago

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