Waves

Question 1

What is amplitude

Answer 1

The maximum displacement of a point on a wave from its in disturbed position

Question 2

What is a wave

Answer 2

A wave transfers energy from one place to another without transferring matter

Question 3

What is oscillation

Answer 3

The vibration of a particle around a fixed position

Question 4

What is a longitudinal wave

Answer 4

Oscillation are parallel to the direction of energy transfers causing compression

Question 5

What are examples of longitudinal waves

Answer 5

Sound
Seismic
P waves

Question 6

How do longitudinal waves travel

Answer 6

Through a series of compression and refractions

Question 7

What are transverse wave s

Answer 7

The oscillation of the waves are perpendicular to the direction in which the wave is trandferrring energy causing compressions

Question 8

What are examples of transverse waves

Answer 8

Electromagnetic waves
Light
Gamma
Microwaves

Question 9

What are mechanical waves

Answer 9

They travel through a substance

Question 10

How are electromagnetic waves different

Answer 10

They travel through a vacuum no substance is needed

Question 11

What is wave length

Answer 11

The lengths of a wave from one compression to another

Question 12

What is time period

Answer 12

The time taken for one wave to pass a point per second

Question 13

What is frequancy

Answer 13

The number of waves that pass a point per seconds

Question 14

What is the formula for wave speed

Answer 14

Wave speed (v)= frequancy x wave length

Question 15

What do waves do when they meet a change in medium

Answer 15

Reflect
Be Absorbed
Travel through(transmit)

Question 16

What is refraction

Answer 16

It is the change of direction of the wave due to the change of speed when entering a new medium (bend)

Question 17

Why does refraction occur

Answer 17

When the speed of the wave changes
Due to the density of materials

Question 18

What is reflection

Answer 18

When a wave rebounds of a medium

Question 19

Why do waves slow down in different substances

Answer 19

Due to the increase of optical density

Question 20

Why do waves bend if it hits denser material at an angle

Answer 20

The wave front hit the medium at a different time thus causing a bend

Question 21

When doe waves not refract in a medium

Answer 21

When it is hitting the medium a t 90 degrees as the wave front hits the medium at the same time

Question 22

How do we change the speed of waves in water

Answer 22

By changing the depth or shallowness of the water as you can’t change the density

Question 23

What is an example of sound reflecting

Answer 23

Echos

Question 24

What are wave fronts

Answer 24

Lines that are used to represent the peaks of transverse waves and compressions of longitudinal waves

Question 25

What is the law of reflection

Answer 25

The angle of the incidence= the angle of reflect

Question 26

What type of waves are the ripples on a water surface

Answer 26

Transverse

Question 27

What is the advantage of repeating measurements and calculating a mean

Answer 27

To reduce the effects of random errors

Question 28

How do we find frequency from a time period

Answer 28

1 / time period

Question 29

Plain how the teacher could determine the speed of the wave using a ripple tank without measuring the wavelength of the wave

Answer 29

Measure distance travelled by a wave using a meter ruler Measure the time taken for a wave to travel to measure distance with a timer Divide distance by time

Question 30

Explain why the ray of light from a Reebok should be as narrow as possible when experimenting refraction

Answer 30

It is harder to judge where the centre of a wide array is hence causing a larger uncertainty

Question 31

How do we find uncertainty

Answer 31

Range divided by two

Question 32

A student is using a car Remote control to drive a toy car car aerial of the toilet is connected to an electrical circuit in the car describe what happens in the electrical circuit when the car aerial absorbs radio waves from the car remote control

Answer 32

Alternating current is induced in the electrical circuit with the same frequency as the radio wave

Question 33

Explain why a car has maximum speed

Answer 33

There is a maximum forward force therefore as the speed increases air resistance increases until the air resistance is equal to the forward force therefore the car cannot accelerate anymore

Question 34

Explain an experiment of measuring the speed of water using a ripple tank

Answer 34

Use a signal generator attached to the good part of a ripple tank to create water waves at a set to frequency. Place A white sheet of paper under the ripple tank and a meter ruler on the edge of the paper. Then place a lamp on top of the water Dim the lights in the lamp and turn on the lamp you should see the wave as shadows on the screen below the tank . Distance between Each shadow lines are equal to one wavelength Measure the distance between the shadow lines there are 10 wave lengths apart the divide the distance by 10 to get frequancy Then use the equation for wave speed

Question 35

Why is it suitable to use a ripple tank to measure the speed of Waves

Answer 35

Because it allows you to measure the wavelength without disturbing the waves

Question 36

How do you find the wavelength of a string on the string exper

Answer 36

Meausere multiple half wave using a ruler then find the mean of them and double to find full wave length

Question 37

How can u make it easier to measure waves on a ripple tank

Answer 37

Use a strobe light. When the strobe lights frequancy matches the waves frequancy the waves will appear stationary so u can measure it

Question 38

How do u sat up the string experiment to measure speed

Answer 38

Connect a string over a pulley to a vibration transducer. Then connect the signal generator to the vibration transducer and switch on. Adjust the frequancy of the signal generator to produce clear waves.