When do nodes and antinodes occur in superposition?
Antinodes occur at maximum displacement and nodes at minimum displacement.
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What formula links speed and frequency?
c=f * wavelength
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What do oscilloscopes do?
Oscilloscopes show PD variation (Vm^-1) against time variation (mscm^-1) with a signal generator producing a trace.
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What is refraction?
Waves slow down in mediums causing their wavelength to decrease in refraction. n=c1/c2=sini/sinr (angles is Snell's Law)
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How did Huygens see waves?
Huygens envisioned waves as wavelets which superpose to produce a new wavefront.
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What is the resonance tube experiment?
In a resonance tube, L1 + k = 1/4 wavelength and L2+k =3/4 wavelength. Using L2-L1, the speed of sound in air can be found
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What's interference and coherence?
Interference patterns are produced due to superposition. Waves meet in phase when path difference is n* wavelength, and in antiphase when its (n+1)*wavelength. Signals are coherent when freq is constant and positions of maxima/minima don't change
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What's the longest wavelength on a string?
Longest wavelength on a string is 2 lengths.
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When are waves in phase and out of phase for Young's double slit experiment?
For Young's Double Slit experience, dsin0= n wavelengths when in phase, and dsin0=n wavelengths/2 when out of phase.
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What's the formula for young's double slits?
wavelength/d=x/L
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What are benefits of diffraction gratings?
Using diffraction gratings increases brightness, divides colours, increases sharpness, and reduces uncertainty in slit separation.
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How are maxima and minima obtained in single slit experiments?
For single slit experiments, when waves are all in phase with no path difference they line up, when out of phase by wavelength=bsin0, they curl up in a circle for no displacement.
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