Wavelength - Elgin Academy

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BGE Waves Test Revision Questions
Frequency Questions
1
Write down the equation for Frequency ( with time ).
2.
If a wave machine produces 5 waves each second what is the frequency of the
machine?
3.
A man stands on a beach and counts 40 waves hitting the shore in 10 seconds.
What is the frequency of these waves?
4.
In 100 seconds a particular smoke alarm emits 1 000 000 sound waves.
What is the frequency of the sound waves?
5.
A girl is sitting on the edge of a pier. It takes 0·625 seconds for one complete
wave to pass underneath her. What is the frequency of the waves?
6.
A girl stands on a beach and counts 15 waves crashing onto the shore in a time
of 1 minute. What is the frequency of the waves?
Wavelength
Helpful Hint
Wavelength ( symbol  ) means the length of a wave. It is measured as the distance
from one point on a wave to an identical point on the next wave.
e.g.

1.
‘A-B’ represents one wavelength in the diagram below.
State two other pairs of letters which represent one wavelength.
1
2.
3.
4.
How many waves are shown in each of the diagrams below?
(a)
(b)
(c)
(d)
The wave train shown below is 20 metres long. How long is each wave?
The wavelength of the waves in the diagram below is 3 cm. What is the distance
between X and Y?
Y
X
5.
What is the wavelength & amplitude of the waves in the diagram below?
2m
2
Calculations:
1
Write down the three equations used in the waves topic.
2
Convert the following units
A
B
C
3
What unit in PHYSICS is
a)
b)
c)
d)
e)
4
2.3 km
4.5 MHz
8.3 GHz
speed ( wavespeed ) measured in
time
wavelength
frequency
distance
List all 7 members of the em spectrum in order of
INCREASING FREQUENCY
5.
A water wave travels along the length of a 25 metre swimming pool in 6.25
seconds. What is the speed of the water wave?
6.
A wave moves along a slinky with a speed of 0.75 m/s. The wave travels the
full length of the slinky in 3.2 seconds. How long is the slinky?
7.
What is the speed of a water wave that has a frequency of 0.5 Hz and a
wavelength of 3.6 metres?
8.
A wave moving through water has a speed of 2.8 m/s and a wavelength of
7.0 cm. What is the frequency of the wave?
9.
A sound wave of frequency 8.5 kHz has a speed of 340 m/s in air.
What is the wavelength of the wave?
10. Describe an application of each of these types of electromagnetic radiation in
the home: Infrared & Microwaves.
11
Why are gamma rays unsuitable for using in mobile phone communication?
Give one reasons for your answer.
3
12. How long will it take visible light to travel through 250 km of water?
13. A radio carrier wave is sent out from BBC Radio 1 in London with a
frequency of 97.5 MHz. A student in Edinburgh (which is 670 km away) is
listening to the broadcast.
a) What is the wavelength of this radio wave?
b) How long will it take the wave to travel from London to Edinburgh?
14. Ultraviolet radiation is one of many types of radiation given off by the Sun.
The ultraviolet radiation from the Sun takes 12 minutes & 27seconds to reach
Mars.
How far away is the planet Mars from the Sun?
15. What type of electromagnetic radiation is given off by a laser?
16 An ultrasound pulse of frequency 7 MHz is transmitted through 8 cm of muscle.
The wavelength of the ultrasound in muscle is 2·29 x 10-4 m.
(a)
Calculate the speed of sound in muscle.
(b)
Calculate the time taken for the ultrasound to pass through the muscle.
4
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