waves

Question 1

what is amplitude?

Answer 1

the height of the wave

Question 2

what is amplitude and frequency measured in?

Answer 2

hertz

Question 3

what is frequency?

Answer 3

the number of complete wave cycles produced each second

Question 4

what is wavelength?

Answer 4

the length of one complete cycle of a wave

Question 5

what are the oscillations of a transverse wave?

Answer 5

oscillations are at right angles to the direction of the wave

Question 6

what are the oscillations of a longitudinal wave?

Answer 6

oscillations are parallel to the direction of the wave

Question 7

what is the method of the required practical: ripple tank? (4)

Answer 7

measure length of tray
fill tray with water, push the ruler down into the water at one end of the tray to create wave
measure the time it takes for the wave to move from one end to the other
calculate speed of wave with equation.

Question 8

how can the wavelength of the water waves in a ripple tank be measured accurately?

Answer 8

measure the length of several waves and then divide it by the total distance by the number of waves

Question 9

what is the human hearing range?

Answer 9

20 Hz- 20,000 Hz

Question 10

how is ultra sound used?

Answer 10

it passes through liquids and reflects off surfaces

Question 11

what is ultra sound?

Answer 11

sound above the range of human hearing

Question 12

why is ultra sound used for unborn babies rather than x-rays?

Answer 12

x-rays show bones and are ionising which can damage cells

Question 13

what is a seismograph?

Answer 13

an image taken from a seismometer which shows the amplitude of the earths motion at various times.

Question 14

what is an ‘S wave’?

Answer 14

waves that can only travel through solids and aren’t detected in the other side of earth (can’t pass through earths liquid core)

Question 15

what are ‘P waves’?

Answer 15

waves they can travel through side and liquids so can pass through all of earths layers and are detected on the other side of the earth

Question 16

what type of waves are ‘S waves’?

Answer 16

transverse

Question 17

what type of waves are ‘P waves’?

Answer 17

longitudinal

Question 18

what are the waves from low frequency to high frequency? (7)

Answer 18

radio
micro
infrared radiation
visible light
ultraviolet
x-ray
gamma

Question 19

what can radio waves be used for? (2)

Answer 19

transmitting radio
tv programmes across low distances

Question 20

what can microwaves be used for? (3)

Answer 20

cooking food
sending signals
mobile phones

Question 21

what can infrared waves be used for? (3)

Answer 21

night vision
security systems
remote controls

Question 22

what can visible light waves be used for? (2)

Answer 22

seeing
cameras

Question 23

what can ultraviolet light waves be used for? (3)

Answer 23

sunbeds
detecting forged bank notes
security coding

Question 24

what can x-ray waves be used for?

Answer 24

x-ray machines

Question 25

what can gamma rays be used for? (3)

Answer 25

sterilising food sterilising medical equipment treatment of cancers

Question 26

when the frequency of electromagnetic radiation increases what else increases?

Answer 26

the energy transferred by each type of radiation

Question 27

which waves can cause cell mutation? (3)

Answer 27

ultra violet x- rays gamma rays

Question 28

how are radio waves produced?

Answer 28

by passing an oscillating electric current through a long wire called an aerial

Question 29

what is a special property microwaves have?

Answer 29

They are absorbed by water molecules

Question 30

how are x-rays used? (2)

Answer 30

electrons from the hot cathode are fired at the tungsten target at high speed. when these energy electrons strike the target some of their energy is changed into x-rays.

Question 31

how are gamma rays emitted?

Answer 31

by certain radioactive materials and have many uses in medicine