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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- A. 5 mm
- B. 1.33 mm
- C. 0.5 mm
- D. 50 mm
Explanation: x=λ D/a, where λ is the wavelength of light, D is the distance between screen and slits, a is the slit separation, and x is the fringe…
Correct answer: 5 mm- A. Stationary Waves
- B. Beats
- C. Interference
- D. Both B and C
Explanation: Explanation:Two waves of slightly different frequencies and travelling in the same direction lead to the production of beats.
Correct answer: Beats- A. Zero
- B. Double the original value
- C. One
- D. Half of the original value
Explanation: Explanation:The Fringe spacing would be doubled. This is because the fringe spacing is proportional to the distance between the slits and…
Correct answer: Double the original value- A. 588 nm
- B. 348 nm
- C. 620 nm
- D. 400 nm
Explanation: Explanation: L = mλ / 2 λ = 2L / m = 2 × 0.233 × 10-3 / 792 = 2 × 233 × 10-6 / 792 = 466 × 10-6 / 792 = 0.588 × 10-6 m = 588 × 10-9 m λ =…
Correct answer: 588 nm- A. Zero amplitude
- B. The sum of the amplitudes of the two waves
- C. Difference of the amplitudes of the two waves
- D. Double the amplitude of either wave
Explanation: The correct answer is A) Zero amplitude. When two sound waves with identical amplitudes are completely out of phase, they interfere…
Correct answer: Zero amplitude- A. 244 Hz
- B. 236 Hz
- C. 248 Hz
- D. 246 Hz
Explanation: The beat frequency is the absolute difference between two frequencies. For the source 'Y' to produce 4 beats with 240 Hz, it can be either…
Correct answer: 244 Hz- A. (m + ½) λ
- B. mλ
- C. d sin θ
- D. 3λ
Explanation: Destructive interference occurs when the path difference between two waves is an odd multiple of half wavelengths, expressed as (m + ½)λ…
Correct answer: (m + ½) λ- A. The path difference of the light waves from the two sources must be large
- B. The interfering waves must be non-coherent
- C. The light waves may come from different sources
- D. The light waves must come from two coherent sources
Explanation: For light waves to successfully interfere the sources of the waves must be coherent, which means they emit identical waves with a constant…
Correct answer: The light waves must come from two coherent sources- A. 23
- B. 12
- C. 0
- D. 1
Explanation: If general equation for destructive interference is given by the relation Optic path difference = (m+(1/2)), where 'm' is an integer, then…
Correct answer: 0- A. (n +½) λ where n = 0, 1, 2, .............
- B. nλ where n = 0, 1, 2, .............
- C. (2n + 1) λ/2 where n = 0, 1, 2, .............
- D. ((n +1)/2) λ2 where n = 0, 1, 2, ............
Explanation: For maximum intensity or bright fringe to be formed at P Path difference, Δz = nλ (n = 0, ±1, ±2, . . . .)
Correct answer: nλ where n = 0, 1, 2, .............- A. nπ radian
- B. 2π n radian
- C. (n+½) π radian
- D. (2n+1) π radian
Explanation: Dark fringes are formed when we have destructive interference and since destructive interferences happen at phase differences being odd…
Correct answer: (n+½) π radian- A. fλ
- B. λ/T
- C. Both A and B
- D. λT
Explanation: Explanation:The speed of a wave can be calculated using the formula: v = fλwhere v is the wave speed, f is the frequency of the wave, and…
Correct answer: Both A and B- A. 650Hz
- B. 20Hz
- C. 26Hz
- D. 3.8x10² Hz
Explanation: We know, The product of wavelength and frequency is speed c of waveMathematically:fx𝞴=cf=c/𝞴f=130/5f=26Hz.
Correct answer: 26Hz- A. Equal to 1
- B. Equal to 2L
- C. Equal to 4L
- D. Equal to 3l/2
Explanation: Equal to 2L: This option is correct. In an open organ pipe, the fundamental wavelength corresponds to the length of the pipe, so the…
Correct answer: Equal to 2L- A. 2m
- B. 4m
- C. 6m
- D. 8m
Explanation: For an open pipe at both ends, the fundamental frequency is given by: f = v/2LWhere v is the speed of sound and L is the length of the…
Correct answer: 4m- A. 4 × T
- B. 2 × T
- C. 3 × T
- D. 1 × T
Explanation: The fundamental mode of a closed-open organ pipe produces a wavelength that is four times the length of the pipe.
Correct answer: 4 × T- A. Halved
- B. Doubled
- C. Quadrupled
- D. Remain the same
Explanation: The correct option is C Quadrupled. The energy transported by a wave is directly proportional to the square of the amplitude of the wave.
Correct answer: Quadrupled- A. Vibrate parallel to the direction of propagation of waves
- B. Vibrate perpendicular in to the direction of propagation of waves
- C. Do not move at all
- D. Vibrate at an angle of 360° to the direction of waves
Explanation: Fact. In longitudinal waves the movement of the particle is along the direction of the wave i.e the movement of particles is usually…
Correct answer: Vibrate parallel to the direction of propagation of waves- A. Wavelength squared
- B. Amplitude squared
- C. Square root of the wavelength
- D. Square root of the amplitude
Explanation: Water is a transverse mechanical wave so we know that the power and energy carried by the wave is directly proportional to the square of…
Correct answer: Amplitude squared- A. 0°
- B. 180°
- C. 90°
- D. 45°
Explanation: When the transverse wave travels from the rarer medium to the denser medium, it gets reflected from the denser medium, where a phase…
Correct answer: 180°