Light, Sound, Mirrors

Question 1

What is true for all convex mirrors?

Answer 1

They reflect light so that it looks to be diverging from a point behind the mirror

Question 2

What is true for all concave mirrors?

Answer 2

The greater the curvature of the mirror, the shorter the focal length

Question 3

What is true for all concave mirrors in terms of light?

Answer 3

Light is reflected and converges to a point close to the mirror

Question 4

What type of image do flat mirrors make?

Answer 4

A virtual, laterally inverted image which is the same distance behind the mirror as the object is in front

Question 5

Which type of reflection occurs with a glass mirror?

Answer 5

Specular reflection

Question 6

Which type of reflection occurs with plastic wrap?

Answer 6

Transparent transmission reflection

Question 7

Which type of reflection occurs with baking paper?

Answer 7

Translucent transmission reflection

Question 8

Which type of reflection occurs with a black jumper?

Answer 8

Opaque absorption reflection

Question 9

Which type of reflection occurs with aluminium foil?

Answer 9

Diffuse reflection

Question 10

What is an example of incandescent light?

Answer 10

A candle

Question 11

Is the moon luminous?

Answer 11

No

Question 12

What are some examples of luminous objects?

Answer 12

Star, lit candle, turned on light globe

Question 13

Place the materials helium, steel and water in ascending order in terms of speed of sound?

Answer 13

Helium, water, steel

Question 14

What is the decibel reading of a quiet outdoor setting?

Answer 14

45 decibels

Question 15

What is the decibel reading of a normal classroom?

Answer 15

70 decibels

Question 16

What is the decibel reading of the threshold of pain?

Answer 16

120 decibels

Question 17

What is the decibel reading of an overhead aircraft?

Answer 17

130 decibels

Question 18

What is sound caused by?

Answer 18

Vibration

Question 19

What is sound?

Answer 19

A mechanical wave, caused by an oscillation through a solid, liquid or gas

Question 20

What is the speed of light through a vacuum or air?

Answer 20

300,000 km/s

Question 21

What is the connection between the amplitude and sound of a wave?

Answer 21

The larger the amplitude of the wave, the louder the sound

Question 22

What is the connection between the number of waves and the pitch of the sound?

Answer 22

The more the number of waves, the higher the pitch of the sound

Question 23

Through which state of matter are vibrations/sound passed through most easily?

Answer 23

Solids, because the particles are closer together than in a liquid or gas

Question 24

How do you calculate the time light has taken to travel?

Answer 24

By dividing the distance by the speed

Question 25

How do you calculate the speed that light has travelled at?

Answer 25

By dividing the distance by the time

Question 26

How do you calculate the distance that light has travelled?

Answer 26

By multiplying the speed by the time

Question 27

What unit of measurement is the time of light travelling calculated in?

Answer 27

Seconds

Question 28

What unit of measurement is the speed of light travelling calculated in?

Answer 28

V (m/s)

Question 29

What unit of measurement is the distance that light travels calculated in?

Answer 29

Kilometres

Question 30

Where does light travel fastest?

Answer 30

In outer space

Question 31

What do all plane mirrors show?

Answer 31

A virtual image of the same size