4.9 What is a Wave Lesson

​4.9 What is a Wave

• ​disturbance - something that moves another thing out of place

• energy - the power to do work

• medium - matter in which something is carried

Multiple Choice

A wave is a disturbance that transfers ________ from one place to another.

• Matter

• Mass

• Energy

• nothing

Multiple Choice

A mechanical wave would be.....

• Water wave
• light wave
• a rock

• the sun

Multiple Choice

A solid, liquid or gas that a wave can pass through.

• medium
• Large
• small
• vacuum

• ​crest - the top part of something

• microwave - an energy wave that is shorter than a radiowave

• signal - a radio wave sent or received

• visible - able to be seen

• wavelength - the distance between one crest of a wave and the next

​Visible light is the light we can see.
A rainbow breaks up white light into the colors of light it is made of.

ROY G. BIV - Red Orange Yellow Green Blue Indigo Violet

Multiple Choice

The height of a wave is called its

• height

• weight

• Amplitude

• Length

Multiple Choice

The distance between a point on one wave and the identical point on the next wave is called

• Height

• Weight

• Length

• Wavelength

Multiple Choice

The top of a wave is called a

• Height

• Crust

• Trough

• Crest

​amplitude - the distance from a place of rest to the crest of a wave

decibel - a unit used to measure sound

Sound - vibrations that travel through the air or another medium and can be heard when they reach a person's or animal's ear.

​Sound can be dangerous - If we listen to sounds above 85 decibels over time it can damage our ears.
Sounds above 120dB can cause immediate damage.
Protecting your ears - turn volumes down and if in a noisy place wear ear protection.

​Sound travels as a longitudinal wave.

Sound is made by vibrations.

A speaker moves back and forth to make sound.

Frequency is how many waves pass a point in 1 second. It is measured in Hertz.

Multiple Choice

What is volume measured in?

• Magic numbers

• Degrees Celsius

• Decibels

• Bells

Multiple Select

Choose the things we can use to protect our ears

Multiple Choice

Sound is produced by -----

• Heat energy

• Low temperatures

• Vibrations

• Friction