The phenomenon of beats in sound waves is due to: MCQ with Answer and Explanation

Question
The phenomenon of beats in sound waves is due to:
A. Interference
B. Diffraction
C. Refraction
D. Reflection
Answer: Option A
Solution (By JKSSB Mock Tests)
Beats occur when two sound waves of slightly different frequencies interfere, causing periodic variation in amplitude (loudness). Beat frequency = |f₁ - f₂|. This is a superposition/interference phenomenon. Reflection, refraction, diffraction don't produce beats. Memory tip: 'Beats = interference of close frequencies; used in tuning instruments'. This conceptual question tests wave superposition understanding, frequently examined in competitive exams. Always distinguish beats (amplitude modulation) from resonance (amplitude increase at natural frequency).
This question belongs to: Science Physics
Request complete Subject PDF

Discuss this Question (0)

No comments yet. Be the first to start the discussion!

Practice More Physics Questions

Question #1
A pendulum has time period 2 s. If its length is increased by 4 times, new period is
A. 1 s
B. 4 s
C. 8 s
D. 2 s
Discuss
Get Complete Subject PDF for Science

Correct Answer: Option B

Explanation:
T ∝ √L, L'=4L => T' = √4 T = 2×2 = 4 s.
This question belongs to: Science Physics
Question #2
The resistance of a wire is R. If its length is doubled and cross-sectional area halved, the new resistance is:
A. R
B. R/4
C. 2R
D. 4R
Discuss
Get Complete Subject PDF for Science

Correct Answer: Option D

Explanation:
Resistance R = ρL/A, where ρ is resistivity (material property). New length L' = 2L, new area A' = A/2. Thus R' = ρ(2L)/(A/2) = ρ·2L·2/A = 4(ρL/A) = 4R. Resistance scales directly with length and inversely with area. Memory tip: 'Double length ⇒ double R; halve area ⇒ double R; combined ⇒ 4×'. This proportional reasoning problem is frequent in electricity sections of competitive exams. Always verify if resistivity changes (it doesn't here, same material).
This question belongs to: Science Physics
Question #3
The root mean square speed of gas molecules is proportional to:
A. Temperature
B. Square root of temperature
C. Inverse of temperature
D. Square of temperature
Discuss
Get Complete Subject PDF for Science

Correct Answer: Option B

Explanation:
From kinetic theory, rms speed v_rms = √(3RT/M), where R is gas constant, T absolute temperature, M molar mass. Thus v_rms ∝ √T. This shows molecular speed increases with temperature but not linearly. Memory aid: 'Kinetic energy ∝ T; KE = ½mv² ⇒ v ∝ √T'. This conceptual question tests kinetic theory understanding, frequently examined in thermodynamics sections of competitive exams. Always use absolute temperature (Kelvin) in gas law calculations; Celsius would give incorrect proportionality.
This question belongs to: Science Physics
Explore All Physics MCQs
Today's Top Topics
Biology 2054 Physics 1287 chemistry 1089
Explore Subjects
Maths 5575 English 15164 Science 4430 Static General Knowledge 6362 Economy GK 2220
Practice Mix
Milk and water are in ratio 4:6 in a 273 L mixture. Quantity of milk?
The blaze ______ they doused was huge.
The 'Rani of Jhansi' is associated with:
The posters were ________ all over the city.
The principal that gives Rs. 453600 interest in 8 years at 9% SI is