P4.1 WAVES

Question 1

what do wave transfer from one place to another?

Answer 1

energy

Question 2

what do waves not transfer?

Answer 2

matter

Question 3

what are the different types of waves ?

Answer 3

light
sound
radio
seismic(earthquakes)
water
infrared
ultra violet
x-rays

Question 4

what does the slinky model show?

Answer 4

that the waves transfer energy and not matter because once the wave has passed the coil of the slinky remained in their original place but the energy had passed down the slinky

Question 5

what is a transverse wave?

Answer 5

a wave where the material the wave is passing through(the medium) is vibrating at 90 degrees o the direction of the energy transfer

Question 6

what is a longitudinal wave?

Answer 6

a wave where the material that the wave is passing through (the medium) is vibrating in the same direction as the energy transfer

Question 7

what are examples of longitudinal waves?

Answer 7

sound
ultrasound
seismic

Question 8

what are examples of transverse waves?

Answer 8

light
water
x-ray
gamma
radio
seismic

Question 9

what is the equation for frequency?

Answer 9

frequency=number of waves/time

Question 9

what is frequency measured in?

Answer 9

hertz

Question 10

what is the frequency of a wave?

Answer 10

the number of waves that pass a certain point in a second

Question 11

calculate the frequency of a water wave where 5 waves pass a certain point in 20 seconds

Answer 11

0.25

Question 12

calculate the frequency of a sound wave where 180 waves pass a certain point in a minute

Answer 12

20

Question 13

what is the period of a wave?

Answer 13

is the time taken for one wave to pass a given point measured in seconds

Question 14

what is the equation for period?

Answer 14

1/frequency

Question 15

what is the equation for frequency?

Answer 15

1/period

Question 16

what is the period of a wave when the frequency is 500?

Answer 16

1/500=0.002s

Question 17

what is the frequency of a wave when the period is 20?

Answer 17

1/20=0.05Hz

Question 18

what type of wave is a water wave?

Answer 18

transverse

Question 19

what is the name for the distance between two peaks?

Answer 19

wave lengths which is measured in newtons(u)

Question 20

what is wave velocity?

Answer 20

the velocity or speed of a wave

Question 21

what is the equation for wave velocity?

Answer 21

frequency x wavelength

Question 22

what is the equation for frequency?

Answer 22

wave velocity/wavelength

Question 23

what is the equation for wavelength?

Answer 23

wave velocity/frequency

Question 24

work out the velocity of a wave when the frequency is 3 and the wavelength is 5

Answer 24

3x5=15m/s

Question 25

work out the frequency of a wave that has a velocity of 340 and a wavelength of 4

Answer 25

340/4=85Hz

Question 26

work out the wavelength of a wave that has a velocity of 340 and a frequency of 200

Answer 26

340/200=1.7m

Question 27

what is refraction?

Answer 27

when light changes direction e.g. when light leaves water

Question 28

what is reflection ?

Answer 28

where light strikes the boundary between two media and remains in the original medium

Question 29

what is the angle of reflection the same as?

Answer 29

the angle of incidence

Question 30

what are angles always measured to?

Answer 30

the normal

Question 31

when light waves travel from one medium to another what can change?

Answer 31

the velocity

Question 32

what can the change in velocity also change?

Answer 32

direction

Question 33

what does light do when it enters a glass block?

Answer 33

it slows down which causes it to bend towards the normal

Question 34

when light leaves the glass block what happens?

Answer 34

it speeds up and bends away from the normal

Question 35

what does the frequency of light mean?

Answer 35

it will refract

Question 36

when light refracts what happens?

Answer 36

blue light will refract more than red light

Question 37

what are the seven colours of the visible spectrum?

Answer 37

red orange yellow green blue indigo violet

Question 38

what is an electromagnetic spectrum?

Answer 38

a group of seven types of wave that share similar properties. the visible spectrum is a small section of this

Question 39

what type of wave are all electromagnetic waves?

Answer 39

transverse waves

Question 40

do electromagnetic waves travel at the same speed?

Answer 40

yes in a vacuum of 3x10^8m/s

Question 41

why is a vacuum empty space?

Answer 41

because there is no atoms

Question 42

how long does it take light to go around the earth?

Answer 42

0.12s

Question 43

how long does it take light to go to the moon and back?

Answer 43

2s

Question 44

what does frequency do when wavelengths decrease?

Answer 44

the frequency increases

Question 45

what are the seven types of electromagnetic radiations?

Answer 45

radio microwave infrared visible ultraviolet x-rays gamma rays

Question 46

how can you remember the different types of electromagnetic radiations?

Answer 46

Rabid Monkeys In Velvet Underpants eXcrete Gummy bears

Question 47

calculate the speed of a radio wave of wavelength 2m and frequency 150000000Hz

Answer 47

150000000 x 2=300000000 m/s

Question 48

calculate the speed of a microwave of wavelength 0.005 and a frequency of 60000000000Hz

Answer 48

60000000000 x 0.005=300000000

Question 49

calculate the speed of a gamma ray wavelength 5x10^-15 and a frequency of 6x10^22

Answer 49

3x10^8

Question 50

why do we need to wear sun cream?

Answer 50

so are skin cant get damaged(sunburnt) if exposed to too much radiation from the sun this is called ultraviolet

Question 51

what three types of electromagnetic radiation is dangerous and why?

Answer 51

ultraviolet, x-rays and gamma rays are dangerous as they can damage of kill human cells. x-rays and gamma rays are also ionising meaning they can lead to cancer

Question 52

what is ionising?

Answer 52

adding or removing electrons from an atom turning it into an ion

Question 53

what makes and electromagnetic radiation more dangerous?

Answer 53

the higher the frequency is

Question 54

why do radiographers who operate x-ray machines in hospitals stand behind shielding?

Answer 54

to reduce their exposure to radiation