Question

A ringing alarm clock is put under a glass jar. The air is slowly removed from the space around it. What will happen as the air is removed? (1 point)
Responses

The clock will slowly become quieter and will ultimately fade from view.
The clock will slowly become quieter and will ultimately fade from view.

The appearance of the clock will not change, but its sound will become fainter.
The appearance of the clock will not change, but its sound will become fainter.

The clock will slowly become less visible, until you can only hear it.
The clock will slowly become less visible, until you can only hear it.

The appearance of the clock and the sound of the clock will not change.

Answer 1

The appearance will not change, but the sound will become fainter.

Explanation: light doesn't need air so you still see the clock, but sound is a pressure wave in a medium; removing the air prevents efficient propagation of the alarm's sound (you may still hear a tiny amount transmitted through the glass).