Physics Test S2

Question 1

Why couldn’t we see the tuning fork clearly

Answer 1

Because it was vibrating so fast

Question 2

What happened to the ball after it hit the tuning fork

Answer 2

The ball jumped away suddenly due to the vibration

Question 3

How did the tuning fork make noise

Answer 3

Through vibrations

Question 4

What are all sounds made by

Answer 4

Vibrations

Question 5

What is frequency?

Answer 5

The frequency of a sound is its pitch

Question 6

What is amplitude?

Answer 6

How loud a sound is

Question 7

What does a wave with high amplitude and high frequency look like?

Answer 7

Tall waves and lots of them close together

Question 8

What does a wave with low amplitude and low frequency look like

Answer 8

Short waves with only a few waves far apart

Question 9

What is a wavelength

Answer 9

The distance between any two adjacent crests

Question 10

What is the line of zero disturbance

Answer 10

Represents a zero amplitude wave (no wave present)

Question 11

What is the formulae for finding frequency

Answer 11

f=N/t

Question 12

What is frequency

Answer 12

Number of whole waves produced each second

Question 13

What can the human ear do?

Answer 13

It can detect sounds within a certain range of frequencies

Question 14

What 3 animals can hear ultrasound

Answer 14

Bat
Dolphins
Moths

Question 15

What 3 animals can hear infrasound

Answer 15

Elephant
Whales
Peacocks

Question 16

Briefly describe the path of light as it passes through the ray box?

Answer 16

When the incidence ray passes into the Perspex into the perpexs at 90 degrees to the normal it does not change paths.

Question 17

In optics the angles are always measured the?

Answer 17

Ray and the normal

Question 18

What is refraction?

Answer 18

The change in speed which occurs when light passes through one optical medium to another

Question 19

What happens when the incident ray goes from air to glass:

Answer 19

The ray bends towards the normal

Question 20

What happens when the emergent ray goes from glass to air?

Answer 20

The ray bends away from the normal

Question 21

What do you notice about the directions of the incidents ray and the emergent ray?

Answer 21

Emergent ray is parallel to the incidence ray

Question 22

Describe what happens to light rays after they enter the Perspex {converging lens}

Answer 22

The light rays start off parallel but go through the converging lens and then are refracted and converge on a focal point

Question 23

Describe what happens to light rays after hitting the perspective {diverging lens}

Answer 23

The parallel light rays come from the ray box and hit the diverging lens and become refracted light rays that have diverged from the diverging lens

Question 24

What happens to the image after using the converging lens

Answer 24

It flips upside down and horizontal
It is also smaller than the actual thing

Question 25

Are thicker or thin lenses more powerful?

Answer 25

Thicker lenses

Question 26

What is the formula for optical power?

Answer 26

P=1/f

Question 27

Are convex lenses positive or negative for focal lengths and optical powers

Answer 27

Positive

Question 28

Are diverging lenses positive or negative in optical power or focal Lents

Answer 28

Negative

Question 29

What does the cornea do?

Answer 29

The transparent outer lens which does most of the eyes refraction

Question 30

What does the pupil do?

Answer 30

A hole that allows the light in , it changes size according to how bright it is

Question 31

What does the lens on an eye do?

Answer 31

Focus’s the light onto the retina , changes thickness to vary the amount of refraction

Question 32

What does the retina do

Answer 32

The light sensitive coating at the back of the eye retina cells changes light energy into the retina to the brain

Question 33

Why do u think the brain causes the pupil changes in size when the light level changes?

Answer 33

It changes to limit light in and changes to take in as much light as it can find

Question 34

What is the blind spot

Answer 34

The point in the retina at which the optic nerve is connected cannot detect light because here are no light sensitive cells light from an object landing on the blind spot cannot be seen

Question 35

What is the human hearing range

Answer 35

20hz to 20,000