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

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

Answer 1

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

Light travels through vacuum, so visibility stays the same. Sound needs a medium (air) to propagate, so removing the air reduces the sound; some vibration can still reach you through the glass/stand, so it may not go completely silent.