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

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

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

Answer 1

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

Reason: light travels through the evacuated jar so the clock still looks the same, but sound needs a material medium (air) to propagate; removing the air prevents the alarm's vibrations from reaching your ears, so the sound fades and can become inaudible.