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# The fi rst excited state of 17F is at 0.495 MeV. Can thep 16O reaction populate this

ISBN: 9781133103721 454

## Solution for problem 23 Chapter 13

Modern Physics for Scientists and Engineers | 4th Edition

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Modern Physics for Scientists and Engineers | 4th Edition

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Problem 23

The fi rst excited state of 17F is at 0.495 MeV. Can thep 16O reaction populate this state? Give yourreasons.

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Doppler Effect (20.7) - Frequency is higher when coming towards the listener - Frequency is lower when moving away from listener - Waves “bunch” in the front while the source moves General Equation for f relative to listener: f = f · VsoundVlistener L sound VsoundVsorce Rules: 1) Velocity is measured with respect to the medium 2) Velocities are positive when moving from listener to source Superposition (21.1) 2 waves passing through each other can momentarily be summed Net Displacement: D +D 1 D 2 net - Node is a point that never moves on D (distance between nodes is half a wavelength, dN = λ 2 - Antinode is the point of maximum displacement (halfway between 2 nodes) Standing Waves (21.2) Travelling to the Right: D = asin(kx − ωt) Travelling to the Left: D = asin(kx + ωt) D 1 D = 2 = 2asin(kx)cos(ωt) = A(x)cos(ωt) 2π A(x) = 2asin(kx) kx = mπ = λ x Standing Waves on a String - When the wave hits a boundary it reflects inverted in the other direction (same v and A) - Phase shifted by π

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