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 11
Define coherent sources.
Describe how thin film interference produces colors in soap bubbles.
Describe the difference between interference and diffraction.
Explain what is meant by the term 'path difference' in the context of wave interference.
Explain why two independent light bulbs do not produce an observable interference pattern.
If the wavelength of light used in a double-slit experiment is increased, what happens to the fringe spacing?
A sound wave of frequency 500 Hz interferes with another sound wave of the same frequency. If the speed of sound is 340 m/s, what is the wavelength of the sound?
A student observes 10 bright fringes in a double-slit experiment over a distance of 2 cm on the screen. What is the average fringe width?
If two waves of amplitude 3 units and 4 units interfere constructively, what is the amplitude of the resultant wave?
If two waves of amplitude 5 units and 2 units interfere destructively and are exactly out of phase, what is the amplitude of the resultant wave?
Constructive interference occurs when the phase difference between two waves is (a) 0° (b) 90° (c) 180° (d) 270°
Destructive interference occurs when the phase difference between two waves is (a) 0° (b) 90° (c) 180° (d) 360°
In a double-slit experiment, if the distance between the slits is increased, the fringe spacing (a) increases (b) decreases (c) remains the same (d) becomes zero
In a double-slit experiment, the distance between adjacent bright fringes is called (a) wavelength (b) fringe width (c) amplitude (d) phase difference
When two waves meet and the resulting amplitude is greater than the amplitude of either wave, this is called _______ interference.
When two waves meet and the resulting amplitude is less than the amplitude of either wave, this is called _______ interference.
A student observes that when two sound waves of slightly different frequencies interfere, a phenomenon called _______ is heard, characterized by periodic variations in loudness.
True or False: Interference can only occur with waves of the same frequency.
True or False: Interference patterns can be observed with both light and sound waves.
True or False: The interference pattern disappears if the phase difference between two waves changes randomly over time.
