Waves Practice Questions
A-Levels · A-Level Physics · 147 free MCQs with instant results and detailed explanations.
147
Total
47
Easy
76
Medium
24
Hard
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Sample Questions from Waves
Here are 10 sample questions. Start a quiz to get randomized questions with scoring.
Q1
Easy
What is the wavelength of a wave if its frequency is 500 Hz and the speed of the wave is 340 m/s?
A.
0.68 m
B.
1.5 m
C.
0.34 m
D.
0.5 m
Show Answer & Explanation
Correct Answer: A
The wavelength (ฮป) can be calculated using the formula ฮป = v/f, where v is the speed of the wave and f is the frequency. Here, ฮป = 340 m/s / 500 Hz = 0.68 m.
Q2
Easy
If a sound wave travels through air and its intensity increases, what happens to the perceived loudness of the sound?
A.
It decreases.
B.
It remains the same.
C.
It increases.
D.
It becomes inaudible.
Show Answer & Explanation
Correct Answer: C
Loudness is directly proportional to the intensity of the sound wave. Therefore, if the intensity increases, the perceived loudness also increases.
Q3
Easy
A wave traveling along a string is described by the equation y(x, t) = A sin(kx - ฯt), where A is the amplitude, k is the wave number, and ฯ is the angular frequency. What does the term A represent?
A.
Wavelength of the wave
B.
Frequency of the wave
C.
Amplitude of the wave
D.
Speed of the wave
Show Answer & Explanation
Correct Answer: C
In the wave equation, A represents the amplitude, which is the maximum displacement of points on a wave from their rest position.
Q4
Medium
A wave travels along a string and has a frequency of 10 Hz and a wavelength of 2 meters. What is the speed of the wave?
A.
20 m/s
B.
5 m/s
C.
10 m/s
D.
15 m/s
Show Answer & Explanation
Correct Answer: A
The speed of a wave is calculated using the formula v = f ร ฮป. Here, f = 10 Hz and ฮป = 2 m, so v = 10 ร 2 = 20 m/s.
Q5
Medium
When two waves of the same frequency interfere constructively, what is the resultant amplitude if each wave has an amplitude of 3 units?
A.
6 units
B.
3 units
C.
9 units
D.
1.5 units
Show Answer & Explanation
Correct Answer: A
In constructive interference, the amplitudes add up. Thus, if both waves have an amplitude of 3 units, the resultant amplitude is 3 + 3 = 6 units.
Q6
Medium
A sound wave in air travels at approximately 343 m/s. If the frequency of the sound is 686 Hz, what is the wavelength of the sound wave?
A.
0.5 m
B.
1.0 m
C.
2.0 m
D.
1.5 m
Show Answer & Explanation
Correct Answer: A
Wavelength is calculated using the formula ฮป = v/f. Here, v = 343 m/s and f = 686 Hz, so ฮป = 343 / 686 = 0.5 m.
Q7
Medium
A wave on a string is described by the equation y(x, t) = 0.05 sin(2ฯ(0.1x - 50t)). What is the amplitude of the wave?
A.
0.05 m
B.
0.1 m
C.
0.025 m
D.
1 m
Show Answer & Explanation
Correct Answer: A
The amplitude of a wave represented by the equation y(x, t) = A sin(kx - ฯt) is A. Here, A = 0.05 m.
Q8
Hard
A sound wave travels from air into water. If the speed of sound in air is approximately 343 m/s and in water is 1482 m/s, how does the wavelength change when it enters the water, given that its frequency remains constant at 440 Hz?
A.
It decreases.
B.
It increases.
C.
It remains the same.
D.
It becomes zero.
Show Answer & Explanation
Correct Answer: B
Since the frequency remains constant while moving from air to water, the wavelength increases due to the higher speed of sound in water. Wavelength = Speed / Frequency.
Q9
Hard
A wave traveling in a medium has a frequency of 500 Hz and a wavelength of 0.4 m. What is the speed of the wave in the medium?
A.
200 m/s
B.
125 m/s
C.
1000 m/s
D.
250 m/s
Show Answer & Explanation
Correct Answer: A
The speed of a wave is calculated using the formula v = f ร ฮป, where v is speed, f is frequency, and ฮป is wavelength. Therefore, v = 500 Hz ร 0.4 m = 200 m/s.
Q10
Hard
A wave traveling along a string is described by the equation y(x,t) = A sin(kx - ฯt), where A is the amplitude, k is the wave number, and ฯ is the angular frequency. If the wave speed is given by v = ฯ/k, what happens to the wave speed if the frequency is doubled while keeping the amplitude constant?
A.
The wave speed remains constant.
B.
The wave speed doubles.
C.
The wave speed quadruples.
D.
The wave speed is halved.
Show Answer & Explanation
Correct Answer: B
The wave speed (v) is directly proportional to the frequency (f), as v = fฮป. Doubling the frequency while amplitude remains constant results in a doubling of the wave speed.
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Practice All 147 Questions →Waves โ A-Levels A-Level Physics Practice Questions Online
This page contains 147 practice MCQs for the chapter Waves in A-Levels A-Level Physics. The questions are organized by difficulty โ 47 easy, 76 medium, 24 hard โ so you can choose the right level for your preparation.
Every question includes a detailed explanation to help you understand the concept, not just memorize answers. Take a timed quiz to simulate exam conditions, or practice at your own pace with no time limit.