Light And Sound

Question 1

A wave transfers _____________. It does not transfer ______________.

Answer 1

A wave transfers energy. It does not transfer matter.

Question 2

In a _______________ wave the vibration of the particles is perpendicular to the direction of energy transfer.

Answer 2

In a transverse wave the vibration of the particles is perpendicular to the direction of energy transfer.

Question 3

In a _______________ wave the vibration of the particles is parallel to the direction of energy transfer.

Answer 3

In a longitudinal wave the vibration of the particles is parallel to the direction of energy transfer.

Question 4

Transverse wave - the _______________ of the particles is __________________ to the direction of energy transfer.

Answer 4

Transverse wave - the vibration of the particles is perpendicular to the direction of energy transfer.

Question 5

Longitudinal wave - the _______________ of the particles is __________________ to the direction of energy transfer.

Answer 5

Longitudinal wave - the vibration of the particles is parallel to the direction of energy transfer.

Question 6

In a longitudinal wave, areas where the particles are pushed together are called _________________ and areas where the particles are spread out are called _________________

Answer 6

In a longitudinal wave, areas where the particles are pushed together are called compressions and areas where the particles are spread out are called rarefactions.

Question 7

A louder sound will have a higher __________________.

Answer 7

A louder sound will have a higher amplitude.

Question 8

A high-pitched sound will have a higher _________________

Answer 8

A high-pitched sound will have a higher frequency.

Question 9

Give an example of a longitudinal wave.

Answer 9

An example of a longitudinal wave is a sound wave.

Question 10

Give an example of a transverse wave.

Answer 10

An example of a transverse wave is a light wave.

Question 11

An object which gives off light is known as….

Answer 11

An object which gives off light is known as a luminous object.

Question 12

How can we see non-luminous objects?

Answer 12

We can see non-luminous objects because they reflect light.

Question 13

When light hits an object and ‘stops’ it is known as…

Answer 13

When light hits an object and ‘stops’ it is known as absorption.

Question 14

When light hits an object and bounces off it is known as…

Answer 14

When light hits an object and bounces off it is known as reflection.

Question 15

A material that lets light through without scattering is known as…

Answer 15

A material that lets light through without scattering is known as a transparent material.

Question 16

What is an opaque material?

Answer 16

An opaque material is one that does not allow light to pass through.

Question 17

An object that scatters light as it passes through is known as…

Answer 17

An object that scatters light as it passes through is known as a translucent object.

Question 18

How does the angle of incidence compare to the angle of reflection?

Answer 18

The angle of incidence is equal to the angle of reflection.

Question 19

What is refraction?

Answer 19

Refraction is the bending of light as it passes from one medium to another.

Question 20

When does refraction occur?

Answer 20

Refraction occurs when light travels through different media.

Question 21

If the speed of a wave decreases as it moves into a new substance it will bend _____________ the normal.

Answer 21

If the speed of a wave decreases as it moves into a new substance it will bend towards the normal.

Question 22

If the speed of a wave increases as it moves into a new substance it will bend _____________ the normal.

Answer 22

If the speed of a wave increases as it moves into a new substance it will bend away from the normal.

Question 23

When the angle of incidence is greater than the critical angle, what will happen to the light?

Answer 23

When the angle of incidence is greater than the critical angle, total internal reflection occurs.

Question 24

If all the light is reflected with a material (e.g. a piece of glass), what is this known as?

Answer 24

If all the light is reflected with a material, it is known as total internal reflection.

Question 25

Give two examples of where total internal reflection is found in real-life applications.

Answer 25

Two examples of total internal reflection are optical fibers and diamonds.

Question 26

What is the name of the coloured circle around the pupil? It controls the size of the pupil.

Answer 26

The name of the coloured circle around the pupil is the iris.

Question 27

What is the purpose of the lens in the eye?

Answer 27

The purpose of the lens in the eye is to focus light onto the retina.

Question 28

What do you call the black part of the eye? It is the opening that lets light in.

Answer 28

The black part of the eye is called the pupil.

Question 29

What is the retina?

Answer 29

The retina is the light-sensitive layer at the back of the eye.

Question 30

What is the purpose of the optic nerve?

Answer 30

The purpose of the optic nerve is to transmit visual information from the retina to the brain.

Question 31

Why do we end up with an inverted image formed on our retina when we look at an object?

Answer 31

We end up with an inverted image on our retina because of the way light is refracted by the lens.

Question 32

What three colours of light can our eyes detect?

Answer 32

Our eyes can detect red, green, and blue light.

Question 33

What are the colours of the spectrum that make up white light?

Answer 33

The colours of the spectrum that make up white light are red, orange, yellow, green, blue, indigo, and violet.

Question 34

The colour of a light depends on what feature of a wave?

Answer 34

The colour of a light depends on the wavelength of the wave.

Question 35

When light enters a prism it splits into the colours of the spectrum, what do we call this effect?

Answer 35

This effect is called dispersion.

Question 36

Why does a blue object appear blue when a white light is shone upon it?

Answer 36

A blue object appears blue because it reflects blue light and absorbs other colours.

Question 37

Why do black objects appear black?

Answer 37

Black objects appear black because they absorb all colours of light.

Question 38

When red and green light is combined, what colour is formed?

Answer 38

When red and green light is combined, yellow is formed.

Question 39

When red and blue light is combined, what colour is formed?

Answer 39

When red and blue light is combined, magenta is formed.

Question 40

When blue and green light is combined, what colour is formed?

Answer 40

When blue and green light is combined, cyan is formed.

Question 41

Sketch a low-pitched sound becoming a high-pitched sound (the volume remains constant).

Answer 41

Sketch a waveform showing increasing frequency while maintaining amplitude.

Question 42

Sketch a quiet-sound becoming a loud sound (the pitch remains unchanged).

Answer 42

Sketch a waveform showing increasing amplitude while maintaining frequency.

Question 43

If a sound is becoming lower pitched, what is decreasing?

Answer 43

If a sound is becoming lower pitched, frequency is decreasing.

Question 44

If a sound is becoming lower in volume, what is decreasing?

Answer 44

If a sound is becoming lower in volume, amplitude is decreasing.

Question 45

What formula can we use to calculate the speed of sound?

Answer 45

The formula to calculate the speed of sound is speed = distance/time.

Question 46

Do sound waves travel fastest in solid, liquid or gas?

Answer 46

Sound waves travel fastest in solids.

Question 47

Do light waves travel fastest through a solid, liquid or gas?

Answer 47

Light waves travel fastest through a vacuum.

Question 48

When calculating the speed of sound using an echo, what must you remember?

Answer 48

When calculating the speed of sound using an echo, remember to divide the total distance by two.