Waves Flashcards
The wave below has a frequency of 14 Hz.
Calculate the speed of this wave.
v = f x λ
v = 14 x 0.10
v = 1.4 ms-1
NOTE the conversion of cm -> m!
What type of wave are microwaves an example of - transverse or longitudinal?
Microwaves are an example of transverse waves.
Name the three quantities shown in this formula.
v = speed
f = frequency
λ = wavelength
(the λ symbol is called ‘lambda’)
What type of wave is a water wave an example of?
A water wave is an example of a transverse wave.
Name the three quantities shown in this formula.
d = distance
v = speed
t = time
How would km (kilometres) be converted into metres?
k (kilo) = x 1000
To convert km –> m, ** multiply by 1000**
Explain why sound cannot travel through a vacuum.
A vacuum is empty space - there are no particles in a vacuum.
For sound to travel, there must be particles that vibrate to transmit the sound waves.
What is meant by the frequency of a wave?
Frequency is the number of waves per second.
What type of wave is a sound wave an example of?
A sound wave is an example of a longitudinal wave.
What is the unit for distance?
The unit for distance is metres (m)
24 waves are produced in 8 seconds.
What is the frequency of the waves?
24 / 8 = 3 Hz
(24 waves in 8 seconds
so 3 waves in 1 second)
What is the unit for amplitude?
The unit for amplitude is metres (m).
The wave below has a frequency of 5 Hz.
Calculate the speed of this wave.
v = f x λ
v = 5 x 3
v = 15 ms-1
What is the amplitude of this wave?
0.7 m
(the amplitude is measured from middle to top of wave)
Water waves pass a harbour wall with a frequency of 4 Hz.
How many waves will pass the wall in 1 minute?
4 Hz = 4 waves per second
In 1 minute, there will be 60 x 4 = 240 waves.
What is the unit for time?
The unit for time is seconds (s).
Name an example of a longitudinal wave.
Sound waves are longitudinal waves.
Complete the following sentence:
All waves carry ……………
All waves carry energy.
What is meant by the wavelength of a wave?
Wavelength is the distance between a point on one wave and the same point on the next wave.
What can sound travel through?
Sound can travel through
* solid
* liquid
* gas
What is the unit for frequency?
The unit for frequency is hertz (Hz).
What is meant by the statement “A frequency of 16 Hz” ?
This means that there are 16 waves per second.
From the diagram shown, identify the amplitude of the wave.
D is the amplitude.
What is meant by the amplitude of a wave?
The amplitude of a wave is the height of the wave, measured from middle to top.
What is the unit for wavelength?
The unit for wavelength is metres (m).
From the diagram shown, identify the wavelength of the wave.
C is the wavelength.
What is the wavelength of this wave?
6 m
True or False :
“Sound can travel through space”
FALSE
Space is a vacuum and sound cannot travel through a vacuum
A loudspeaker emits sound with a frequency of 500 Hz.
Explain this sentence in your own words.
There are 500 waves produced per second.
What is the wavelength of this wave?
1.2 m
How would cm (centimetres) be converted into metres?
100 cm = 1 m
To convert cm –> m, divide by 100
What is the unit for speed?
The unit for speed is metres per second (ms-1).
