Waves

Question 1

What type of wave is light and water?

Answer 1

Transverse

Question 2

What is a transverse wave?

Answer 2

It means that energy lives from at right angles from the oscillations

Question 3

Give an example of a longitudinal ray, and what does it mean?

Answer 3

Sound. Energy moves the same direction as the oscillations.

Question 4

What type of wave is sound?

Answer 4

Longitudinal

Question 5

What is a peak?

Answer 5

The highest point of an oscillation

Question 6

What is amplitude?

Answer 6

The maximum displacement from the peak/trough to the undisturbed level

Question 7

What is wavelength?

Answer 7

Distance between peak to peak or trough to trough.

Question 8

How is frequency portrayed on a wave machine?

Answer 8

The amount of troughs/peaks shown.

Question 9

What is the equation for wave speed?

Answer 9

Wave speed(m/s) = wavelength(m) * frequency (Hz)

Question 10

What is the wave speed of a wave with a frequency of 14 Hz and a wavelength of 4m?

Answer 10

56 m/s

Question 11

If a wave has a wavelength of 250 m and a wave speed of 3500 m/s, what is its frequency?

Answer 11

14 Hz

Question 12

What is frequency measured in?

Answer 12

Hertz (Hz)

Question 13

What is wave speed measured in?

Answer 13

Metres per second (M/S)

Question 14

What is the speed of light?

Answer 14

3*10^8m/s or 300,000,000 m/s

Question 15

What is the order of the rainbow?

Answer 15

Red orange yellow green and blue indigo violet

Question 16

What is specular reflection?

Answer 16

When the surface that light reflects off is smooth, and it all goes into your eyes. If it is bumpy, it is diffuse scattering.

Question 17

Are images in mirrors virtual? And what does virtual mean?

Answer 17

Yes. Virtual means they looks like they are behind the mirror

Question 18

How do filters work?

Answer 18

They absorb all other colours except the colour of the filter

Question 19

If you look at a white light through a red filter what will you see?

Answer 19

Red

Question 20

If you look at a cyan light through a green filter what will you see?

Answer 20

Green

Question 21

If you look at magenta through a green filter, what will you see?

Answer 21

Black

Question 22

A ray of light bounces off a mirror, but the light isn’t as strong, why?

Answer 22

Some of it is absorbed by the mirror

Question 23

Can light travel through vacuums?

Answer 23

Yes

Question 24

Why can’t sound travel through vacuums?

Answer 24

Sound needs particles to vibrate and thus create sound.

Question 25

What do lenses do?

Answer 25

They use refraction to spread out or focus light.

Question 26

In refraction, which way does light bend?

Answer 26

Towards the normal

Question 27

Where does light first hit in your eye?

Answer 27

The retina

Question 28

Why is sound quickest in solids?

Answer 28

As the particles are closer together so the vibrations are quicker.

Question 29

What is the speed of sound in air?

Answer 29

330 m/s

Question 30

How do you find the speed of sound using an echo?

Answer 30

Distance * 2
______________
Times

Question 31

Barnabas hits together two wooden blocks down an alleyway 160m long, it takes approximately 1.2 seconds for the sound to echo back. What was the speed of sound?

Answer 31

160*2
________= 267 m/s
1.2

Question 32

Ethan hits together two wooden blocks down an alleyway 240m long, it takes approximately 4 seconds for the sound to echo back. How many m/s below the speed of sound is the result?

Answer 32

240 * 2
————- = 120. 330 - 120 = 210
4
Ethan is stupid.

Question 33

Assuming it is travelling through a vacuum, how long will it take for light to travel 3,000,000m?

Answer 33

0.01 seconds

Question 34

Ibrahim wears 3D glasses (half red, half blue) however he is confused when half of his blue physics book is normal and the other is black. Why does this happen?

Answer 34

Because the blue side of the glasses will reflect the blue book, however the red side will absorb it, leaving black(the absence of light)