The harder you tap an object, the lesser it will vibrate.
The more an object vibrates, the louder is the sound.
The loudness of the sound depends on the weight of the vibrating object.
The size of the object does not affect the loudness or softness of sound.
Slow vibrations create a high note.
Faster vibrations give low frequency.
Faster vibrations give high frequency.
Both a and b
22 000 vibrations per second
22 vibrations per second
18 vibrations per second
180 000 vibrations per second
Like light, sound travels at different speeds.
Sound waves travels faster through a warmer medium.
Sound travels faster than light.
Sound travels faster through solids.
Keep the room bigger.
Use smooth wall materials.
Keep the room smaller.
Use curtains and rugs.
Speak in a loud voice.
Shout into another person's ear.
Avoid making unnecessary noise.
Tune the TV and radio set to full volume.
Sound travels through air only.
Sound can be absorbed.
Sound can be reflected.
Sound travels through air, water, and solids.
The loudness of sounds can be modified but the pitch cannot.
The pitch and loudness can be modified.