p6

Question 1

What are the two types of waves

Answer 1

-longitudinal
-transverse

Question 2

What do all waves do

Answer 2

All waves transfer energy from one place to another

Question 3

What are ocillations

Answer 3

The movement of waves up and down

Question 4

What are the oscillations like in transverse waves

Answer 4

Occultations are perpendicular to the direction of energy transfer

Question 5

What are the oscillations like in longitudinal waves

Answer 5

Oscillations are parallel to direction of energy transfer

Question 6

What do all longitudinal waves require

Answer 6

A medium to travel in eg liquid or solid

Question 7

What is amplitude

Answer 7

The maximum displacement of a point on a wave away from its undisturbed positions

Question 8

What is a wavelength

Answer 8

The distance from a point on one wave to the equivalent point on the adjacent wave

Question 9

What is frequency of waves

Answer 9

-number of waves passing a point per second
-hertz (Hz)
-1 Hertz=1 wave per second

Question 10

What is the period of a wave

Answer 10

The time(in seconds) for one wave to past a point

Question 11

What is the equation for period

Answer 11

1/frequency(Hz)

Question 12

What is wave speed

Answer 12

The wave speed is the speed which the wave moved through the medium (the speed at which energy is transferred)

Question 13

What is the equation for wave speed

Answer 13

Frequency(Hz) x Wavelength(m)

Question 14

What method can we use to Measure speed of sound waves in air

Answer 14

Two people 50m apart,person a had symbols,person b has timer,person b darts the timer when they see symbols clashing,stops when they hear it,use distance travelled/time taken

Question 15

What are the problems with method to measure wave speed

Answer 15

-every person has differnt reaction time
-reduce error by having a large number of observers with timer and find mean

Question 16

What are electromagnet wanes

Answer 16

Transverse waves that transfer energy from the source to absorber

Question 17

What are the properties of waves on the left(red) side of the electromagnetic spectrum

Answer 17

-low frequency
-low wavelength

Question 18

What are the properties of waves on the right side of the electromagnetic spectrum

Answer 18

-high frequency
-short wavelength

Question 19

What does
Rich,Men,In,Vegas,Use,eXpensive,Gadgets
Show

Answer 19

Radio,microwaves,infrared,visible,ultraviolet,x-Rays,gamma

Question 20

Why can electromagnetic waves travel through a vacuum

Answer 20

They do not need a medium to travel through

Question 21

What speed do waves travel through in a wave

Answer 21

3x10(8) m/s
(300,000,000)

Question 22

What is refraction

Answer 22

Waves can change direction when they change speed moving one medium to another

Question 23

What happens if waves enter or leave the medium at right angles

Answer 23

They do not change direction

Question 24

What is a wavefront

Answer 24

An imaginary line that connects all the same points in a set of waves

Question 25

What happens when light waves move from air to glass

Answer 25

-first part of the wavefront slows when it moves into glass -those parts of the wavelength get closer -wavelength gets smaller and change direction to the normal

Question 26

What happens to wave direction when they sped up

Answer 26

Change direction way from the normal

Question 27

What happens when EM waves are absorbed or generated

Answer 27

Changes take place in atoms or nuclei of atoms

Question 28

What happens to the nucleus of gamma rays are emitted

Answer 28

The nucleus has less energy then it had at the start

Question 29

How can radio waves be produced

Answer 29

-radio waves can be produced when electrons oscillate in electrical currents

Question 30

What are the used of radio waves

Answer 30

-transmit radio -terrestrial TV signals

Question 31

What are the uses of micro waves

Answer 31

-heat food -communicate with satellites

Question 32

What are the use of infrared waves

Answer 32

-Heat food -infrared cameras

Question 33

What are the uses of visible light

Answer 33

-communication in fibre optics

Question 34

Uses of ultra violet

Answer 34

-energy efficient lightbulb -sun tanning

Question 35

Uses of x-rays and gamma rays

Answer 35

-medical treatment -medical imaging -detect cancers

Question 36

Describe how the radio waves reaching the car aerial produce signals in the electrical circuit of the car radio.

Answer 36

-(the car aerial) absorbs radio waves or energy -electrons are made to vibrate (in the aerial) -creating an alternating current (in the aerial circuit) -the (signal) frequency is the same (as the radio wave)

Question 37

Explain why the light refracts as it passes from air into glass

Answer 37

-speed / velocity in the glass is lower -so the edge of the wave(front)entering the glass slows down -but the part of the wave(front) in the air continues at the higher speed / velocity