Question

if an astronaut popped a balloon on the moon, would his partner be able to hear it? no, although the sound waves will travel to his partner, the sound waves would not be transmitted through his partner’s helmet. yes, the air expanding out of the balloon as it popped will transmit the sound waves to his partner. no, the moon has no atmosphere so there is no medium through which the sound waves can be transmitted. yes, the sound waves will first be transmitted through the astronaut’s body, then through the ground, and finally through his partner’s body.

Explanation:

Sound waves require a medium (like air, liquid, or solid) to travel. The moon has no atmosphere (so no air medium). When a balloon pops on the moon, without a medium (like air) to carry the sound waves, the sound can't travel to the partner. Option A is wrong as helmets can transmit sound if there's a medium initially, option B is wrong as the moon has no air for the expanding air to transmit sound, and option D's transmission path (body - ground - body) isn't feasible as the main issue is the lack of atmospheric medium for sound to travel over distance; the moon's surface is also a vacuum - like environment for sound propagation between the two astronauts without a proper medium.

Answer:

C. No, the moon has no atmosphere so there is no medium through which the sound waves can be transmitted.