10 minutes maximum! Can you do it in 5? |
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1. What is the name given to the addition of waves when they meet at a point?
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2. Waves produce clear interference patterns when they are 'coherent'. This means the waves....
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3. Noise cancelling headphones work by using the effect of interference. | |||||||||||||||||
Two sound waves will 'cancel' each other out if they ...
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4. An interference pattern is produced by a double slit. Here are two statements about the central maximum of the interference pattern produced:
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Which statements are true?
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5. A microphone is placed in front of two loudspeakers as shown here. The amplitude of the sound detected is very high, indicating that constructive interference is occurring at this point, compared to other points nearby. |
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What condition is needed for constructive interference at this point?
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6-9: A green laser is directed at 2 narrow slits. A clear diffraction effect can be seen on a screen, with fringes as shown here: |
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6. The formula on the right is used for double slit diffraction. Which letter/symbol in the formula represents the distance between fringes?
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7. What happens to the intensity of the fringes, and the distance between fringes if the green laser is replaced with a red laser of equal power output?
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8. What happens if the green laser remains but the distance between the 2 slits is decreased?
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9. What happens if the green laser remains, the spacing between slits stays constant but each of the slit widths is decreased?
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10. A single slit can produce a diffraction pattern with light and dark bands. What produces this pattern?
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