Waves Practice Questions
ATAR (Australia) · ATAR Physics · 143 free MCQs with instant results and detailed explanations.
143
Total
49
Easy
69
Medium
25
Hard
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Sample Questions from Waves
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Q1
Easy
What is the frequency of a wave if its period is 0.5 seconds?
A.
2 Hz
B.
0.5 Hz
C.
1 Hz
D.
0.2 Hz
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Correct Answer: A
Frequency is the reciprocal of the period. Thus, frequency = 1/period. Here, frequency = 1/0.5 = 2 Hz.
Q2
Easy
Which of the following types of waves requires a medium to travel through?
A.
Electromagnetic waves
B.
Sound waves
C.
Light waves
D.
Radio waves
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Correct Answer: B
Sound waves are mechanical waves that require a medium (like air, water, or solids) to propagate. In contrast, electromagnetic waves can travel through a vacuum.
Q3
Easy
If the wavelength of a wave is doubled, what happens to its frequency, assuming the wave speed remains constant?
A.
Doubles
B.
Halves
C.
Remains the same
D.
Quadruples
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Correct Answer: B
The frequency and wavelength are inversely related when the wave speed is constant, so if the wavelength is doubled, the frequency is halved.
Q4
Medium
Which of the following correctly describes the relationship between frequency and wavelength in a wave traveling at a constant speed?
A.
Frequency is directly proportional to wavelength.
B.
Frequency is inversely proportional to wavelength.
C.
Frequency and wavelength are independent of each other.
D.
Frequency is equal to wavelength.
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Correct Answer: B
For a wave traveling at constant speed, frequency (f) and wavelength (ฮป) are inversely related as described by the equation v = f ร ฮป, meaning if frequency increases, wavelength decreases when speed is constant.
Q5
Medium
A tuning fork produces a sound wave with a frequency of 440 Hz. If the speed of sound in air is approximately 343 m/s, what is the wavelength of the sound wave?
A.
0.78 m
B.
0.50 m
C.
1.20 m
D.
1.00 m
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Correct Answer: A
The wavelength (ฮป) can be calculated using the formula ฮป = v / f. Here, ฮป = 343 m/s / 440 Hz = 0.78 m, which is the correct wavelength for the sound wave produced by the tuning fork.
Q6
Medium
When a wave passes from one medium to another, what happens to its speed and wavelength?
A.
Both speed and wavelength increase.
B.
Speed increases, wavelength decreases.
C.
Speed decreases, wavelength increases.
D.
Speed decreases but wavelength remains constant.
Show Answer & Explanation
Correct Answer: C
When a wave enters a denser medium, its speed decreases due to the medium's properties, while its wavelength increases because the frequency remains constant. Hence, speed decreases and wavelength increases.
Q7
Medium
What phenomenon causes a sound wave to bend around a barrier?
A.
Reflection
B.
Refraction
C.
Diffraction
D.
Interference
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Correct Answer: C
Diffraction is the bending of waves around obstacles and openings. Sound waves bend around barriers due to their wave nature, allowing them to be heard even when the source is not in direct line of sight.
Q8
Hard
A sound wave in air has a frequency of 440 Hz. If the temperature of the air is increased, how does this affect the speed of the sound wave?
A.
The speed decreases.
B.
The speed remains constant.
C.
The speed increases.
D.
The effect on speed is unpredictable.
Show Answer & Explanation
Correct Answer: C
As temperature increases, the speed of sound in air increases because the molecules move faster and transmit the sound wave more quickly. Therefore, option C is correct.
Q9
Hard
Two waves traveling in the same medium are represented by the equations y1 = 0.05 sin(2ฯ(0.5x - 100t)) and y2 = 0.05 sin(2ฯ(0.5x - 100t + ฯ)). What is the phase difference between the two waves?
A.
0 radians
B.
ฯ radians
C.
2ฯ radians
D.
90 degrees
Show Answer & Explanation
Correct Answer: B
The phase difference is determined by examining the sine arguments. The second wave has an additional phase of ฯ compared to the first wave. Thus, the phase difference is ฯ radians, confirming that B is the correct answer.
Q10
Hard
When two coherent light waves, each with an amplitude of 3 units, interfere constructively, what is the resultant amplitude?
A.
6 units
B.
3 units
C.
9 units
D.
0 units
Show Answer & Explanation
Correct Answer: A
In constructive interference, the amplitudes of the waves add up linearly. Thus, if both waves have an amplitude of 3 units, the resultant amplitude is 3 + 3 = 6 units.
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Waves โ ATAR (Australia) ATAR Physics Practice Questions Online
This page contains 143 practice MCQs for the chapter Waves in ATAR (Australia) ATAR Physics. The questions are organized by difficulty โ 49 easy, 69 medium, 25 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.