Light & Sound Learning Objectives

Question 1

1

Year 7 Light & Sound Learning Objectives

Answer 1

that in the same substance, light travels in a straight line and at a fixed speed.

Question 2

2

Year 7 Light & Sound Learning Objectives

Answer 2

that the speed of light in air/vacuum is 3 x 108 m/s

Question 3

3

Year 7 Light & Sound Learning Objectives

Answer 3

that light is energy

Question 4

4

Year 7 Light & Sound Learning Objectives

Answer 4

that light spreads out as it travels from a source thus becoming dimmer

Question 5

5

Year 7 Light & Sound Learning Objectives

Answer 5

that shadows are formed because light cannot pass through objects and also light travels in a straight line

Question 6

6

Year 7 Light & Sound Learning Objectives

Answer 6

that the size of the source affects the shadow

Question 7

7

Year 7 Light & Sound Learning Objectives

Answer 7

that an umbra is the absence of light

Question 8

8

Year 7 Light & Sound Learning Objectives

Answer 8

that a penumbra is a reduction in the amount of light

Question 9

9

Year 7 Light & Sound Learning Objectives

Answer 9

how solar and lunar eclipses are formed

Question 10

10

Year 7 Light & Sound Learning Objectives

Answer 10

that light travels faster than sound so we see things before we hear them

Question 11

11

Year 7 Light & Sound Learning Objectives

Answer 11

that luminous objects give out light; that we see non-luminous objects because they scatter light to our eyes

Question 12

12

Year 7 Light & Sound Learning Objectives

Answer 12

that light can be reflected at flat mirrors and when it is the angle of incidence = angle of reflection

Question 13

13

Year 7 Light & Sound Learning Objectives

Answer 13

the use of i = r in periscopes, etc.

Question 14

14

Year 7 Light & Sound Learning Objectives

Answer 14

that in reflection an image is virtual

Question 15

15

Year 7 Light & Sound Learning Objectives

Answer 15

that in reflection the image is laterally inverted

Question 16

16

Year 7 Light & Sound Learning Objectives

Answer 16

that in reflection from a plane mirror the object size = image size

Question 17

17

Year 7 Light & Sound Learning Objectives

Answer 17

that in reflection from a plane mirror the image to mirror distance = object to mirror distance

Question 18

18

Year 7 Light & Sound Learning Objectives

Answer 18

how to locate an image in a plane mirror by drawing ray diagrams

Question 19

19

Year 7 Light & Sound Learning Objectives

Answer 19

that sound is made by objects that vibrate

Question 20

20

Year 7 Light & Sound Learning Objectives

Answer 20

that the frequency of vibration of the source is measured in Hertz (Hz)

Question 21

21

Year 7 Light & Sound Learning Objectives

Answer 21

how sound is made in different musical instruments

Question 22

22

Year 7 Light & Sound Learning Objectives

Answer 22

that a vibrating source causes the layers of air around it to move

Question 23

23

Year 7 Light & Sound Learning Objectives

Answer 23

that sound travels by compressing and expanding the surroundings

Question 24

24

Year 7 Light & Sound Learning Objectives

Answer 24

that sound travels as a longitudinal wave

Question 25

25

Year 7 Light & Sound Learning Objectives

Answer 25

that sound travels best through solids and worst through gases because of the arrangement of the particles

Question 26

26

Year 7 Light & Sound Learning Objectives

Answer 26

the relative speed of sound in different mediums

Question 27

27

Year 7 Light & Sound Learning Objectives

Answer 27

that sound waves cannot travel through a vacuum because there are no molecules

Question 28

28

Year 7 Light & Sound Learning Objectives

Answer 28

that sound waves detected by the ear cause the ear drum to vibrate

Question 29

29

Year 7 Light & Sound Learning Objectives

Answer 29

the structure of the ear

Question 30

30

Year 7 Light & Sound Learning Objectives

Answer 30

how sound is transmitted through the ear to the brain

Question 31

31

Year 7 Light & Sound Learning Objectives

Answer 31

that different people have different ranges of hearing

Question 32

32

Year 7 Light & Sound Learning Objectives

Answer 32

that the average human range of hearing is 20 to 20,000 Hz

Question 33

33

Year 7 Light & Sound Learning Objectives

Answer 33

that loudness is measured in decibels (dB’s)

Question 34

34

Year 7 Light & Sound Learning Objectives

Answer 34

that 0 dB is the threshold of hearing and 130 dB’s is the threshold of pain whilst 140 dB’s causes damage

Question 35

35

Year 7 Light & Sound Learning Objectives

Answer 35

that loud sounds can have permanent and temporary effect on the ear

Question 36

36

Year 7 Light & Sound Learning Objectives

Answer 36

that some common causes of ear damage

Question 37

37

Year 7 Light & Sound Learning Objectives

Answer 37

that noise is unwanted sound

Question 38

38

Year 7 Light & Sound Learning Objectives

Answer 38

that the level of noise can be reduced by controlling the source, absorbing the sound, blocking the sound, reflecting or scattering the sound, destroying the sound by interference