Question

In the bell jar experiment, a vacuum is created. So when the bell is rung we can't hear it. But where does the sound energy go?

Answer 1

The energy is stored as vibrations in the material itself instead of travelling through the medium as sound like it usually would. There is no sound energy to begin with in the vacuum. The energy is absorbed by the jar itself, eventually the jar itself would vibrate therefore produce its own sound.

Answer 2

Thank you

Answer 3

No problem

Answer 4

Can u answer this
A sound wave is reflected from a brick wall.
Compared with the incident wave, the reflected wave has-
A. Shorter wavelength
B. A greater amplitude
C. the same speed
D.a greater frequency
E.the same velocity

Answer 5

C is the correct answer. Amplitude wouldn't change, frequency wouldn't change, wavelength wouldn't change but velocity does change. Velocity is a vector so has a direction and magnitude, when it hits the wall the reflected wave has a negative direction in comparison to the incident wave. Speed is scalar and so wouldn't change and is therefore the answer I would chose.