Wave Interference
Physics ⇒ Waves and Sound
Wave Interference starts at 9 and continues till grade 12.
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See sample questions for grade 9
Describe the difference between constructive and destructive interference.
Describe what happens when two waves of different amplitudes and the same frequency meet in phase.
Explain why two light waves of different colors do not produce a stable interference pattern.
If two sound waves of slightly different frequencies interfere, what phenomenon is heard?
A student observes alternating loud and soft sounds when two tuning forks of slightly different frequencies are sounded together. What is this phenomenon called?
In a double-slit experiment, what causes the bright and dark bands on the screen?
A student creates two sets of ripples in a ripple tank using two dippers vibrating at the same frequency. The ripples overlap and form a pattern of alternating lines of constructive and destructive interference. What is the name of this pattern, and what does it indicate about the waves?
In a laboratory experiment, two speakers are placed 2 meters apart and emit sound waves of the same frequency and amplitude. A student walks along a line parallel to the speakers and hears alternating loud and soft sounds. Explain why this pattern occurs and what it demonstrates about wave interference.
Which of the following best describes constructive interference?
(1) Waves combine to form a wave with smaller amplitude
(2) Waves combine to form a wave with larger amplitude
(3) Waves pass through each other unchanged
(4) Waves are reflected back
Which of the following best describes the superposition principle?
(1) Waves reflect off surfaces
(2) Waves combine by adding their displacements
(3) Waves always cancel each other
(4) Waves change speed when they meet
Which of the following is a necessary condition for sustained interference?
(1) The waves must have the same frequency
(2) The waves must have different speeds
(3) The waves must be of different types
(4) The waves must be stationary
Which of the following is an example of destructive interference in real life?
(1) Noise-cancelling headphones
(2) Echo in a canyon
(3) Rainbow formation
(4) Refraction in water
Fill in the blank: The _______ is the number of beats heard per second when two sound waves of slightly different frequencies interfere.
Fill in the blank: The _______ of two waves is the difference in their phase angles.
In a standing wave, the points of maximum amplitude are called _______.
The beat frequency produced by two sound waves is equal to the _______ of their frequencies.
True or False: Interference can change the energy of the individual waves.
True or False: Interference can occur with both transverse and longitudinal waves.
True or False: Interference can only occur with sound waves.
True or False: Interference patterns can be observed with water waves.
