Waves Flashcards
(32 cards)
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.
