6.1 Sound waves

Things that ____________ make sounds. Vibrating means moving backwards or forwards about a __________ point.

• vibrate, fixed

• move, random

• shake, loose

• jump, central

When we hit the drum, the ​ (a)   of the drum vibrates producing sound. When we play a guitar, the ​ (b)   on it makes to and fro motion and produces sound. Sound produced by vibrating ​ (c)   of tuning fork. While you are speaking, your ​ (d)   vibrates and makes the sound.

• membrane
• string
• prong
• vocal cords

Sound waves are created by vibrating objects, it moves backwards and forwards. This vibrating object bumps into adjacent _________________. These air molecules bump into other nearby air molecules and so on, transmitting the vibration through the air to our ears.

• air molecules

• water droplets

• light particles

• metal atoms

Not all sounds are the same. Sounds can vary in both loudness and __________.

• pitch

• color

• shape

• weight

_______ pitched sounds are like whistles. _____ pitched sounds are like a thunder/drum.

• High, Low

• Low, High

• Soft, Loud

• Loud, Soft

Hit the drum with more force, it vibrates more. This makes a __________ sound.

• louder

• softer

• colder

• slower

The vibration of the air particles in very loud sound can be so strong that it may cause damage to the ____________.

• eardrum

• tongue

• nose

• teeth

The air particles vibrate backwards and forwards in the ________ direction with the sound wave.

• same

• opposite

• random

• vertical

Sound will travel through anything that has particles: gas, liquid or​ (a)   . We call the substance sound travels through the “​ (b)   ”. The sound wave makes the particles of the medium vibrate ​ (c)   and forwards.

• solid
• medium
• backwards
• upwards
• plasma
• vacuum

Sound travels fastest in ​ (a)   as when the particles are ​ (b)   , transmitting of the vibration is ​ (c)   .

• solid
• closer
• easier
• further apart
• gas
• more difficult