Waves p2

Question 1

transverse

Answer 1

vibration is at a right angle to direction of energy transfer eg light and water waves

Question 2

longitudinal

Answer 2

vibration parallel to direction of energy transfer eg p waves, sound waves

Question 3

amplitude

Answer 3

from halfway (peak or trough)

Question 4

wavelength

Answer 4

distance from peak to peak or trough to trough

Question 5

period

Answer 5

time for one complete wave to pass a point

Question 6

frequency

Answer 6

no of waves passing a point each second

Question 7

normal and angle of reflection

Answer 7

1)fake line at right angle to surface
2)angle between normal and reflected ray

Question 8

incident ray and angle of incidence

Answer 8

1)wave before reflected
2)angle between incident ray and normal

Question 9

steps for a ray diagram

Answer 9

1)reflect point exactly as image
2)draw 2 rays from object to mirror
3)reflect the rays to match up w image
4)draw dotted line from mirror to image

Question 10

virtual image

Answer 10

formed by light rays, appearing to spread out, cannot be projected onto a screen

Question 11

human sound range

Answer 11

20Hz-20kHz

Question 12

ultrasound

Answer 12

1)sound waves above 20 kHz
2)when arriving at a boundray, they partially reflect and transmit
3) the time delay of sending and receiving ultrasonic pulse, helps us determine the depth of that boundray

Question 13

seismic waves

Answer 13

waves in earthquake- p and s waves

Question 14

p waves

Answer 14

longitudinal, travel thru solid and liquid rock, faster in solid

Question 15

s waves

Answer 15

transverse, only travel thru solid rock

Question 16

EM spectrum order

Answer 16

longest:
1)radio
2)micro
3)infrared
4)visible light
5)ultraviolent
6)x ray
7)gamma
:shortest

Question 17

how is an EM wave travelled

Answer 17

from 1 medium to another- either reflected, absorbed or transmitted, depending on substance, wavelength and distance

Question 18

refraction

Answer 18

change of direction of a wave from 1 medium to another- when the wave changes speed

Question 19

use of gamma rays

Answer 19

1)used for medical imaging and radiotherapy
2)when emitted the nuclear energy in nucleus decreases

Question 20

use of x rays

Answer 20

1)produced by rapid deceleration of electrons
2)used for medical imaging or medical treatment
absorbed by bones

Question 21

fluorescence

Answer 21

absorbs UV light, to emit longer wavelength of visible light

Question 22

use of microwaves

Answer 22

1)pass easily thru atmosp-used for satellites
2)used for heating food, bluetooth, mobil phone network

Question 23

relationships of waves

Answer 23

1)inc freque, velo inc
2)inc wavele, velo inc
3)period invers propo to frequen
4)smol period, high frequ, high velo

Question 24

use of radio waves

Answer 24

transmit terrestrial tv (aerial) and radio signals
travel long distances before being absorbed

Question 25

use of infrared

Answer 25

cooks food or heaters-energy is easily absorbed by surfaces of objects- cameras

Question 26

use of visible light

Answer 26

fibre optic comms eg telephone and cable tv signals

Question 27

use of UV

Answer 27

energy efficient bulbs, short wavelengths, carries more energy. suntanning- cancer risk and ageing