Waves

Question 1

What is the Doppler effect?

Answer 1

It is when the frequency gets from high to low or low to high because the source of the sound gets closer or further away quickly from the receiver changing the frequency

Question 2

What is the wave length?

Answer 2

The distance between two crusts or troughs

Question 3

What is amplitude?

Answer 3

The displacement of a waves vibrations

Question 4

How do you change a waves direction?

Answer 4

With reflection, refraction and dispersion

Question 5

What are the two types of waves

Answer 5

Transverse and longitudinal

Question 6

Def of a transverse wave

Answer 6

A ‘ is one in which the vibration is at right angles to the direction of motion of the wave

Question 7

Longitudinal wave

Answer 7

A ‘ is one in which the vibrations are parallel to the direction of motion of the wave

Question 8

Wavelength is measured in?

Answer 8

Cm/m

Question 9

What is frequency?

Answer 9

Frequency is the number of waves passing a point in 1 second

Question 10

Frequency is measured in?

Answer 10

Hertz/Hz

Question 11

What is the amplitude of a wave?

Answer 11

It is the distance between the crest and the middle of the wave or the trough and the middle of the wave

Question 12

Amplitude is measured in?

Answer 12

Cm/m

Question 13

Wavelength can also be know as?

Answer 13

Lamda

Question 14

Speed is measured in?

Answer 14

m/s (metres per second)

Question 15

What is the calculation for frequency speed and wavelength

Answer 15

Frequency x wavelength = speed

Question 16

What is a progressive wave?

Answer 16

It’s a disturbance which carries energy from one place to another without transferring matter

Question 17

What are mechanical waves transmitted by?

Answer 17

They are transmitted by particles that are vibrating in a medium

Question 18

What are all waves created by?

Answer 18

Vibrations

Question 19

All waves transfer…

Answer 19

Energy

Question 20

What is a transverse wave?

Answer 20

It is a wave in which all the vibrations are at right angles to the direction of motion of the wave

Question 21

What is a time period?

Answer 21

It is the time it takes for 1 wave to be made

Question 22

What does the end of the electromagnetic spectrum have more of than the beginning?

Answer 22

Frequency and energy

Question 23

What does the beginning of the electromagnetic spectrum have bigger of than the end

Answer 23

Wavelength

Question 24

What is the law of reflection?

Answer 24

The law of reflection says that the angle of incidence and the angle of reflection are always the same

Equation = I (degree sign) = R (degree sign)

Question 25

There are 4 important characteristics about an image in a plan mirror...

Answer 25

1. The image is virtual. Can’t be captured on paper 2. The image is laterally inverted. This means that the image is swapped from side to side (image is backwards) 3. The image is the same size as the object 4. The image is the same distance behind the mirror than the object is in front of the mirror

Question 26

``` Refracted index (N) = Sin (I) (angle of incidence) Sin (R) (angle of refraction) ```

Answer 26

.

Question 27

What happens when the angle of incidence is greater than the critical angle?

Answer 27

Total internal reflection (T.I.R)

Question 28

When does T.I.R occur?

Answer 28

It occurs when the Ray is in water/glass travelling towards air and the angle of incidence has to be greater than the critical angle

Question 29

When does a ray/light not refract?

Answer 29

When it hits the thing at a 90 degree angle

Question 30

What is the critical angle?

Answer 30

It is the angle of incidence at which the refracted Ray lies along the surface of the material

Question 31

When does refraction happen?

Answer 31

Refraction happens when the incidence Ray is less than the critical angle

Question 32

How are sounds made?

Answer 32

By vibrations or oscillations

Question 33

Why is there no sound in a vacuum?

Answer 33

Because there are no particles in a vacuum and sound works by vibrations passing from particle to particle

Question 34

Speed = distance / time

Answer 34

.

Question 35

Distance = speed x time / 2

Answer 35

.

Question 36

Wavelength = frequency

Answer 36

.

Question 37

What is the law of refraction?

Answer 37

When light passes through one transparent medium to another, the SIN I and SIN R are directly proportional Equation = Sin I directly proportional Sin R