waves for y11 mocks

Question 1

what do waves do

Answer 1

transfer energy from one place to another but no matter

Question 2

why is our brain able to build up images or tunes from light and sound it recieves

Answer 2

as we can interpret sometimes the energy as meaningful information

Question 3

what is period

Answer 3

time it takes for 1 complete oscillations

Question 4

what is frequency

Answer 4

no of complete oscillations per secons

Question 5

tranverse

Answer 5

oscillations are perpendicular to direction of energy transfer

Question 6

what are examples of transverse waves

Answer 6

em waves
water waves
strings on guitar

Question 7

longitudinal waves are and have

Answer 7

sound waves and seismic P waves

they have compressions and rarefactions

Question 8

what may happen when waves hit a boundary

Answer 8

absorbed
transmitted
reflected

Question 9

what is specular reflection

Answer 9

when normals are all in the same direction as the surface is flat eg a mirror so we can see ourselves from the clear image that is produced

Question 10

what is diffuse reflection

Answer 10

when the surface of a material is uneven so normals are all in many different directions so you cant normally see yourself

Question 11

when does refraction happen

Answer 11

when a ray enters a medium at an angle

Question 12

when a material enters a less dense medium

Answer 12

the ray refracts away from the normal

Question 13

what happens if you pass white light through a triangular prism

Answer 13

all colours will bend to different degrees creating a rainbow from all the spread out colours

Question 14

When a wave travels into a more dense medium, the wave speed decreases what happens to the frequency

Answer 14

stays the same

Question 15

em waves speed in a vacuum

Answer 15

3x10 8 m/s

Question 16

how can we generate radio waves

Answer 16

use a transmiter connected to an oscilloscope to see frequency of wave we produce which is the same as the alternating current
generate radio wave

use reciever to absorb energy and generate alternating current which is displayed on another oscilloscope

Question 17

convex/converging

Answer 17

direct rays of light to principal focus

Question 18

concave

Answer 18

disperse the light

Question 19

the shorter the focal length

Answer 19

the stronger the lens/more curved

Question 20

image is always virtual

Answer 20

when a concave lens is used

Question 21

on a convex lens when do you draw dotted lines

Answer 21

when object is within focal length as the real rays will never meet

Question 22

what affects the colour appears

Answer 22

wavelengths of light hitting it
the properties of the object

Question 23

what do opaque objects do to light

Answer 23

they either absorb or reflect all wavelengths of light(or maybe range eg red and green making yellow)

Question 24

for transparent objects what happens to light

Answer 24

most light would be transmitted with only small fraction absorbed or reflected(eg glass in windows)

Question 25

for translucent objects what happens to light

Answer 25

they only transmit some light with the colour being which wavelengths transmitted most

Question 26

how do colour filters work

Answer 26

they only allow certain wavelengths to pass through and absorbing rest

Question 27

an object cooler or warmer than its surroundings

Answer 27

cooler will warm slowly
warmer will cool slowly

Question 28

as temperature on an intensity increases

Answer 28

the intensity of every emitted wavelength also increases(with short increasing more than longer wavelengths)

Question 28

what is intensity

Answer 28

how much energy radiation transfers to a given area in a certain amount of time

Question 29

why is the earth hotter in the day

Answer 29

more energy is absorbed than emitted but at night this is opposite

Question 30

what happens to the freq in sound waves

Answer 30

stays the same

Question 31

what is the range of human hearing

Answer 31

20-20000hz

Question 32

what is ultrasound

Answer 32

frequencies above 20000hz

Question 33

what are some ways we use ultra sound

Answer 33

pre natal scanning where waves reflected are detected or checking quality of products in industry

there is also echo sounding which we use s=dt

Question 34

what are seismic waves types

Answer 34

P waves and S waves

Question 34

why do bats produce echo location

Answer 34

to communicate and for echolocation

Question 35

describe P waves and S waves

Answer 35

P waves-longitudinal and travel through solids and liquids-much faster

S waves are transverse -only go through solids

Question 35

what would the journey of P waves be

Answer 35

it would constantly be refracted and curve as it goes through different mediums (liquid outer core/mantle)