Which property of a wave is the distance from one crest to the next crest?
Wavelength
Amplitude
Frequency
Period
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WhyThe wavelength is the distance between two consecutive points that are in phase, such as crest to crest.
2Multiple choice · Easy
What is the unit of frequency?
Hz
m
m/s
s
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WhyFrequency is measured in hertz (Hz), where 1 Hz equals one complete oscillation per second.
3Multiple choice · Easy
In a transverse wave, the oscillations of the medium are:
Perpendicular to the direction of wave travel
Parallel to the direction of wave travel
In the same direction as wave travel
At 45 degrees to wave travel
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WhyIn a transverse wave the particles vibrate at right angles (perpendicular) to the direction the wave travels.
4Multiple choice · Easy
Which of these is a longitudinal wave?
Sound
Light
A ripple on water
A radio wave
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WhySound is a longitudinal wave because the air particles vibrate back and forth along the direction of travel, forming compressions and rarefactions.
5Multiple choice · Easy
The amplitude of a wave is best described as:
The maximum displacement from the rest position
The distance between two crests
The number of waves per second
The speed of the wave
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WhyAmplitude is the maximum displacement of a point on the wave measured from its rest (undisturbed) position.
6Multiple choice · Easy
When a light ray reflects off a plane mirror, the angle of incidence is:
Equal to the angle of reflection
Greater than the angle of reflection
Less than the angle of reflection
Always 90 degrees
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WhyThe law of reflection states the angle of incidence equals the angle of reflection, both measured from the normal.
7Fill in the blank · Easy
Both the angle of incidence and the angle of reflection are measured from a line called the , which is drawn at right angles to the surface.
Answer:
normal
WhyThe normal is the line perpendicular to the surface at the point where the ray strikes; all wave angles in reflection and refraction are measured from it.
8Fill in the blank · Easy
Lines drawn to represent the crests of a wave, showing its shape and direction, are called .
Answer:
wavefronts / wave fronts
WhyWavefronts join points that are in phase (such as crests); the wave travels at right angles to its wavefronts.
9Multiple choice · Medium
A wave has a frequency of 50 Hz and a wavelength of 4 m. What is its speed?
200 m/s
54 m/s
12.5 m/s
0.08 m/s
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WhyUsing v = f x wavelength = 50 x 4 = 200 m/s.
10Multiple choice · Medium
A sound wave travels at 340 m/s with a frequency of 170 Hz. What is its wavelength?
2 m
0.5 m
510 m
57800 m
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WhyRearranging v = f x wavelength gives wavelength = v / f = 340 / 170 = 2 m.
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