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 64 of 65
1261. In stationary waves:
- A. There is no net transfer of energy
- B. Energy is evenly distributed at all points
- C. Phase is the same for all points
- D. Both (a) & (b)
Explanation: In stationary waves, there is no net transfer of energy because the waves are confined, oscillating back and forth within a fixed region.
Correct answer: There is no net transfer of energy- A. Wavelength
- B. Frequency
- C. Velocity
- D. Speed
Explanation: The correct answer is Frequency. The number of loops in a standing wave is directly related to its frequency, as frequency determines how…
Correct answer: Frequency- A. 10 cm
- B. 30 cm
- C. 40 cm
- D. 120 cm
Explanation: The correct answer is 40 cm. For a string fixed at one end and free at the other, the second harmonic corresponds to one full wavelength…
Correct answer: 40 cm- A. Identical
- B. Different
- C. Any of Option A or B
- D. Stationary waves cannot be formed
Explanation: Stationary waves, or standing waves, are formed when two waves of the same amplitude and frequency travel in opposite directions along the…
Correct answer: Identical- A. 2 Hz
- B. 4 Hz
- C. 5 Hz
- D. 10 Hz
Explanation: (Remember that node to node is half A) so λ= 10/5 and then λ = 2x2=4mThen we find out the frequency using the formula v = fλ ie 20 = f(4)…
Correct answer: 5 Hz- A. Half wavelength
- B. Integral number of wavelength
- C. Quarter wavelength
- D. Odd integral number of half wavelength
Explanation: For two coherent monochromatic sets of waves to interfere constructively in the region of superposition, the path difference between them…
Correct answer: Integral number of wavelength- A. Fringe width will decrease
- B. Fringe width will increase
- C. Fringe width will remain the same
- D. Fringe width will become less intense
Explanation: Fringe width will increase: If the orange light has a longer wavelength compared to the green light, then the fringe width will increase.
Correct answer: Fringe width will increase- A. Interference
- B. Dispersion of light
- C. Scattering of light
- D. Refraction of light
Explanation: The colors in a soap bubble are due to interference of light. When light reflects off the outer and inner surfaces of the thin soap film…
Correct answer: Interference- A. The lamps are not point sources.
- B. The lamps emit light of different amplitudes.
- C. The light from the lamps is not coherent.
- D. The light from the lamps is white.
Explanation: When light from two separate lamps falls on a screen, interference patterns typically do not form because the light from each lamp is not…
Correct answer: The light from the lamps is not coherent.- A. Refraction and diffraction
- B. Interference and reflection
- C. Interference and diffraction
- D. Diffraction and polarization
Explanation: When monochromatic light passing through two parallel slit and falls on a screen, the pattern produced is due to interference and…
Correct answer: Interference and diffraction- A. 2x
- B. x
- C. 3x
- D. 4x
Explanation: For double slits: Wavelength λ = xa / Dwhere x: separation of fringes,a: slit separation / distance between slits,D = distance from slits…
Correct answer: x- A. Dispersion
- B. Absorption of light
- C. Scattering of light
- D. Interference of light
Explanation: The correct answer is interference of light. The colors seen in thin films result from the interference of light waves reflected from the…
Correct answer: Interference of light- A. 0.5 Sec
- B. 2 Sec
- C. 1 Sec
- D. 0.25 Sec
Explanation: The beat frequency is determined by the difference between the two frequencies: Δf = 260 Hz - 256 Hz = 4 Hz.
Correct answer: 0.25 Sec- A. Halved
- B. Unchanged
- C. Doubled
- D. Zero
Explanation: In Young's double-slit experiment, the fringe width is calculated using the formula:wavelength * distance_to_screen /…
Correct answer: Unchanged- A. mπ
- B. 2 mπ
- C. mπ/2
- D. None
Explanation: Factual. General form for path difference is given as =2𝞹 Option A, C and D are not correct according to this.
Correct answer: 2 mπ- A. Remains constant
- B. Becomes Half
- C. Becomes double
- D. Becomes four times
Explanation: As v=sqrt(T/d),Where T is tension and d is linear density of the stringAlso,d=m/l(mass per unit length)And mass is directly proportional…
Correct answer: Becomes Half- A. Remains constant
- B. Becomes half
- C. Becomes double
- D. Becomes four times
Explanation: The speed of transverse waves on a string is given by the formula v = √(T/μ), where T is the tension and μ is the linear density (mass per…
Correct answer: Becomes half- A. λ = v/f
- B. λ = vf
- C. λ = f/v
- D. None of above
Explanation: speed = frequency x wavelength Rearrange the formula and you get: wavelength = speed / frequency
Correct answer: λ = v/f- A. Elasticity
- B. Density
- C. Homogeneity
- D. All of the above
Explanation: The correct answer is D, "All of the above" because the wave velocity in any medium depends on all of these factors: elasticity, density…
Correct answer: All of the above- A. 50 nm
- B. 500 nm
- C. 5000 nm
- D. 100 nm
Explanation: Using the formula v = fλ, where speed of light in vacuum (v) = 3 x 108 m/sF = 6 × 14 Hzλ = v/f = 3 x 108 / 6 × 1014 λ = 500 nm
Correct answer: 500 nm