Sound, Vibration

A vibration is a movement of a particle about a _________ point

• Fixed

• Moving

• None

To-and-Fro movement about a fixed point is called_______

• Rotation

• Circulation

• Vibration

Sound is produced by a _________body

• Moving

• Vibrating

• Stationary

When a vibrating object moves towards air particles, it _____ them together

• Squashes

• Extend

• pull

When the object, in vibration, moves away from air particles, they ________

• are compressed

• spread out

• nothing happens

When an object vibrates towards air particles, the particles come closer to each other. In this region, the pressure of air

• Increases

• Decreases

• Remain the same

When the vibrating object moves away from the air particles, the particles are spread out. In this region, the air pressure______

• Increases

• Decreases

• does not change

Identify a region of high air density

• A

• B

• C

• None

When the ruler is vibrating as show in the image, when the ruler moves downwards to position c, what effect it has on the position a of the ruler

• The air density above the ruler increases

• The air density above the ruler decreases

• Nothing happens