Free Waves MCQs with Answers
1,281 Waves MCQs from Physics, each with the correct answer and a written explanation of why it is correct. Free and unlimited, with no account needed.
Progressive waves transfer energy through oscillations, with wavelength, frequency, amplitude and wave speed related by v = fλ; sound speed depends on the medium. Superposition produces interference and stationary waves in strings and organ pipes, while simple harmonic motion describes the oscillation itself and must be distinguished from wave propagation.
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1,281 questions · page 47 of 65
- A. Vector sum
- B. Scalar product
- C. Vector product
- D. calar product of the displacement due to those waves individually
Explanation: Vector sum - Correct: The principle of superposition states that when two or more waves overlap, the resultant displacement at any point…
Correct answer: Vector sum- A. 1:16
- B. 1:4
- C. 4:1
- D. 2:1
Explanation: Correct. Intensity (I) is proportional to the square of the amplitude (A), i.e., I ∝ A².
Correct answer: 1:4- A. 9:1
- B. 1:9
- C. 4:1
- D. 1:4
Explanation: Correct. Let A₁ = 2A and A₂ = A. Maximum amplitude = A₁ + A₂ = 3A Minimum amplitude = A₁ - A₂ = A Maximum intensity ∝ (3A)² = 9A² Minimum…
Correct answer: 9:1- A. 17 Hz
- B. 34 Hz
- C. 68 Hz
- D. 306 Hz
Explanation: Wavelength is the distance between consecutive nodes and antinodes. For the case of the second harmonic the distance between alternated…
Correct answer: 68 Hz- A. 345.2 m/s
- B. 340 m/s
- C. 350 m/s
- D. 330 m/s
Explanation: Use the shortcut formula: Vx = Vs + 0.61( T)Vx= 332+ 0.61 (22)Vx= 345.2
Correct answer: 345.2 m/s- A. fc - fmax to fc - fmin
- B. fc + fmin to fc + fmax
- C. fc - fm
- D. fm - fc
Explanation: Lower sidebands (LSB) range from fc-fmax to fc-fmin.
Correct answer: fc - fmax to fc - fmin- A. 100 Hz
- B. 50 Hz
- C. 20 Hz
- D. 10 Hz
- E. 200 Hz
Explanation: The distance traveled by the wave along the X-axis in one complete cycle is the wavelength, which is given as 2 cm in the problem.
Correct answer: 50 Hz- A. 4.5 cm
- B. 5 cm
- C. 2.5 cm
- D. 1.25 cm
Explanation: Loops of stationary waves consists of nodes and antinodes . The distance between two consective antinodes (crest) or nodes (trough) is…
Correct answer: 2.5 cm- A. Beats
- B. Stationary waves
- C. Light waves
- D. Sound waves
Explanation: When two slightly different frequency waves superimpose, beats are formed.
Correct answer: Beats- A. 0.20m
- B. 0.40m
- C. 0.80m
- D. 1.60m
Explanation: In a tube that is open at both ends, the fundamental frequency (first harmonic) of a longitudinal standing wave corresponds to a…
Correct answer: 0.80m- A. The direction of its displacement remains same
- B. The direction of its displacement is reversed
- C. The displacement disappears
- D. The displacement becomes double
Explanation: Option A: The direction of its displacement remains the same: This means that when the transverse wave reflects from the boundary between…
Correct answer: The direction of its displacement is reversed- A. It becomes one-ninth as large
- B. It becomes one-third as large
- C. It becomes three times larger
- D. It becomes nine times larger
Explanation: Intensity is inversely proportional to the square(due to the inverse square law) of distance from the source, as a larger distance means…
Correct answer: It becomes one-ninth as large- A. λ
- B. 2λ
- C. λ/2
- D. λ/4
Explanation: An antinode is the point of max displacement, and antinodes are separated by nodes, point of minimal displacement.
Correct answer: λ/2- A. N-f
- B. N/f
- C. Nxf
- D. N+f
Explanation: When two tuning forks with slightly different frequencies are sounded together, they produce beats, which are periodic variations in sound…
Correct answer: N+f- A. An incident crest on reflection disappears
- B. An incident trough on reflection becomes double
- C. An incident crest on reflection becomes a trough
- D. An incident crest on reflection remains crest
Explanation: If a crest of a transverse wave, in a denser medium, is incident at a point of a rarer medium, as the particles of rarer medium are free…
Correct answer: An incident crest on reflection remains crest- A. Green shift
- B. Red shift
- C. Blue shift
- D. None of these
Explanation: Redshift takes place when a star moves away from the earth. The red shift occurs due to Doppler's effect formed in light.
Correct answer: Red shift- A. Destructive interference
- B. Constructive interference
- C. Beats
- D. Diffraction
Explanation: Constructive interference occurs only when the path difference between the two waves is an integral multiple of the wavelength of the…
Correct answer: Constructive interference- A. 292 Hz
- B. 284 Hz
- C. 290 Hz
- D. 288 Hz
Explanation: Beat frequency is given by the equation; Beat frequency = f1-f2Whereas f1 is AAnd f2 is BSince the frequency of the B tuning fork is 280…
Correct answer: 284 Hz- A. Same
- B. Different
- C. Increasing
- D. Decreasing
Explanation: Consider the circle,the source is at the centre of the circle and the observer is moving on the circumference of the circle.The observer…
Correct answer: Same- A. 8/3
- B. 3/8
- C. 1/6
- D. 1/3
Explanation: An organ pipe closed at one end (P1) vibrating in its first harmonic has a wavelength of 4 times the length of the pipe (since it forms a…
Correct answer: 1/6