Science Test 24

The speed of a wave is 5 m/s. It's wavelength is 2 m. What is the frequency of the wave?

2.5 Hz

The frequency of a wave is 20 Hz. Its speed is 100 m/s. What is the wavelength of the wave?

5 m

A wave has a frequency of 50 Hz and a wavelength of 10 m. What is the speed of the wave?

500 m/s

What is the angle formed by the normal and the barrier?

90°

What is the Doppler Effect?

A change in the frequency of waves.

What is a medium?

A medium is a substance through which waves can travel through.

What is a reflected wave?

A wave that bounces off from a barrier.

What is an incident wave?

A wave that strikes a barrier.

What is intensity?

Amount of sound energy that a wave carries past a certain area each second

What are three features of a wave?

Amplitude, frequency and wavelength.

When a wave moves from one medium to another at an angle, it _____.

Bends

What causes refraction as waves move from one medium to another?

Change of speed.

What are compressions?

Compression is the part of the wave where the particles are close together.

The apparent change in the frequency of wave is called the _______ ______.

Doppler Effect

All waves carry ______.

Energy

Water waves carry ______

Energy

When a wave moves through a medium, only ______ moves from place to place.

Energy.

The speed of a wave is equal to _________ times wavelength.

Frequency

What is the equation used to find the speed of a wave?

Frequency X Wavelength

Amplitude is the ______ of a wave.

Height.

The _____ is the unit used to measure frequency.

Hertz

Is the frequency of sound waves from a train whistle high or low as the train comes toward you?

High

What is a wave that strikes a barrier called?

Incident waves

What happens when a wave strikes a barrier?

It bounces back.

In what direction is a wave bent when it moves at an angle from a more dense medium to a less dense medium?

It is bent away from the normal

The _______ energy of moving particles produces waves.

Kinetic

Some waves, such as _____ waves do not require a medium.

Light

What is the normal?

Line at right angles to a barrier

The particles of the wave move back and forth in a ____________ wave.

Longitudinal

Water is a ______ for waves.

Medium

Wavelengths can be measured in ______ or centimeters.

Meters

The Doppler effect is caused by ______.

Motion

Do all waves need a medium?

No, light waves don't need a medium.

The frequency of a sound wave appears to change when either the source of the waves or the _____ move.

Observer

Are oceans waves transverse or longitudinal waves?

Ocean waves are a combination between the two types of waves.

The difference between waves depends on how the _________ of the wave move.

Particles

What are rarefactions?

Rarefaction is the part of a wave where the particles are far apart.

What is a wave that bounces back from a barrier called?

Reflected wave

The bending of a wave is called __________.

Refraction

The speed of a light wave ______ __ when it moves from water into air.

Speeds up

Waves travel through a medium at ________ line.

Straight

What is the law of reflection?

The angle of reflection always equals the angle of incidence.

What is refraction?

The bending of a wave at an angle as it moves from one medium to another.

What is reflection?

The bouncing back of a wave.

What are the two parts of a transverse wave?

The crest; high point of a transverse waves and the trough; the low point of the wave.

Earthquakes cause waves travel through Earth. What is the source energy for these waves?

The movement of the plates.

What makes things appear closer in the ocean?

The refraction of light waves.

What happens when a wave strikes a barrier that does not absorb all of its energy?

The wave will bounce off.

Waves hit a dock more often when a boat is moving ______ the dock.

Toward

When a wave moves at an angle from a less dense medium to a more dense medium, it is bent ______ the normal.

Toward

The particles of the wave move up and down in a __________ wave.

Transverse

What are two kinds of waves called?

Transverse and longitudinal

The parts of a transverse wave are the crest and the ______.

Trough

There are ___ kinds of waves.

Two

Light waves can travel through a ______.

Vacuum

What happens to water particles as a wave moves through water?

Water particles move in circles.

One hertz is equal to one ____ per second.

Wave

Refraction is caused by a change in ____ _____.

Wave speed

All waves have amplitude, __________, and frequency.

Wavelength

The number of _____ passing a point in one second is called frequency.

Waves

What are waves?

Waves are disturbances that transfer energy from place to place.

Waves can often be seen moving around fields of wheat. What is the medium for these waves?

Wheat