WorksheetsRevision - Unit 3 - Waves
Total questions: 46
Worksheet time: 23mins
Choose the appliances that use EM Waves.
EM = Electromagnetic
Phone
Microwave
TV remote
All of these
A wave is a transfer of _________.
energy
matter
Which is the correct wavelength?
A
B
Which is the correct amplitude?
A
B
The red wave has a ... (1)
The blue wave has a ...(2)
1 - high frequency
2 - low frequency
1 - low frequency
2 - high frequency
1 - high amplitude
2 - low amplitude
1 - low amplitude
2 - high amplitude
The time to produce one wave =
Frequency
Period
The number of waves per second =
Frequency
Period
Imagine you have created water waves with a frequency of 5 HZ.
How many waves will pass a particular point in 6 seconds?
5X6 = 30 waves
6/5 = 1.2 waves
What is the frequency of this wave?
4 Hz
1/4 Hz
What is the period of this wave?
4 seconds
1/4 seconds
Dan sees one wave crest pass him every 3 seconds.
The distance between each crest is 6 meters.
What is the speed of the wave?
9 m/s
18 m/s
2 m/s
Which graph shows the correct relationship between frequency and wavelength?
1
2
A?
Transverse
Longitudinal
B?
Light
Sound
Water
C?
Transverse
Longitudinal
D?
Light wave
Sound Wave
Water Wave
F?
Light wave
Sound wave
Water wave
The particles in this wave are moving ...
Left to right
Up and down
The energy in this wave are moving ...
Left to right
Up and down
Light and sound waves can refract.
Refract = (choose all that apply)
bend
change direction
disappear
Waves can refract when they enter a medium of different _________.
thickness
density
size
What is a medium?
Something a wave travels through.
Something that produces a wave.
What is the law of reflection?
The angle of incidence is always larger than the angle of reflection.
The angle of incidence = angle of reflection
Light is an electromagnetic wave.
True
False
All light is visible.
True
False
EM Waves
________ have the longest wavelength.
________ have the shortest wavelength
radio waves
gamma waves
gamma waves
radio waves
Which EM waves were the first form of wireless communication?
Radio waves
Gamma waves
Micro waves can be used for long distance communication.
True
False
Why are micro waves called 'micro' if they are not small?
Because the person who discovered them thought they were the smallest.
Because they are the shortest type of radio wave.
(1) is used for frequencies too small for humans to detect.
(2) is used for frequencies too large for humans to detect.
ultra
infra
infra
ultra
The visible part of the EM spectrum is a _________ portion.
large
small
The sun can produce ...
all frequences of EM waves
radio waves and microwaves
visible light and UV light
Which frequencies does our atmosphere let through?
- Gamma waves
- Visible light
- UV waves
- Radio / Micro waves
- Visible light
- Some infrared and UV
- Radio / Micro waves
- Visible light
- X-rays and Gamma waves
Can visible light be used for long distance communication?
Yes. Fibre optics.
No.
How does visible light travel in fibre optics cables?
Reflects in mirrors
Total Internal Reflection
What are x-rays predominantly used for?
Killing bacteria
Scanning objects
Gamma can ...
Cause cancer
Destroy cancer
Both
Can light travel through a vacuum?
Yes
No
Can sound travel through a vacuum?
Yes
No
Why do microwaves heat our food faster than normal heat convection?
Microwaves travel through the food and vibrate all the water particles.
Microwaves spin the food particles causing friction heat.
If microwaves can cook food, and our phones use microwaves, why don't our brains get cooked?
Because our phones have a special heat blocker to make the microwaves safe.
Because our phones use much less energy / less intensity / smaller amplitude.
Fluorescent material
Material that glows in the dark.
Material that glows under UV light.
Some animals can see UV frequencies.
True
False
The ozone layer stops ...
UVC
gamma
Luminous
An object that reflects light
An object that makes its own light
Can sound waves refract?
Yes
No, only light waves.
