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 10
A sound wave of amplitude 3 units interferes destructively with another sound wave of amplitude 3 units. What is the amplitude of the resulting wave at the point of complete destructive interference?
Calculate the path difference required for the first minimum (dark fringe) in a double-slit experiment.
Define the term 'coherent sources' in the context of wave interference.
Describe the difference between constructive and destructive interference using the concept of phase difference.
Describe what is meant by 'beats' in sound waves.
Explain what is meant by the term 'path difference' in the context of wave interference.
Explain why two light bulbs do not produce an observable interference pattern.
If the path difference between two waves is an integer multiple of the wavelength, what type of interference occurs?
If the path difference between two waves is an odd multiple of half the wavelength, what type of interference occurs?
If two waves of equal amplitude and frequency are 180° out of phase, what type of interference will occur?
If two waves of equal amplitude and frequency are in phase, what type of interference will occur?
In a double-slit experiment, bright fringes are observed on a screen. What causes these bright fringes?
In a double-slit experiment, if the wavelength of light is increased, what happens to the distance between adjacent bright fringes?
In a ripple tank experiment, two point sources produce circular waves. At certain points, the water surface is calm. What type of interference occurs at these points?
The equation for the resultant amplitude (A) of two waves of equal amplitude (a) and phase difference φ is A = 2a cos(φ/2). If φ = 0, what is the value of A?
Two sound waves of frequencies 256 Hz and 260 Hz interfere. What is the beat frequency produced?
What is wave interference?
A student observes that when two speakers emitting the same frequency are placed facing each other, there are points in the room where the sound is very loud and other points where the sound is very soft or even silent. Explain why this pattern occurs.
A water wave travels through two narrow gaps and produces an interference pattern on the surface of a pond. If the distance between the gaps is increased, what happens to the spacing between the interference fringes?
Describe how the principle of superposition leads to the formation of nodes and antinodes in a standing wave.
