A photon moving in the +x-direction scatters off a free stationary electron. The wavelength of the incident photon is 0.0310 nm. After the collision, the electron moves at an angle a below the +x-axis, while the photon moves at an angle = 66.3° above the +x- axis. NOTES: Use the formulae sheet for the values of constants and keep at least four significant figures in intermediate results. The answer to (a) does not have a sign. (a) What is the angle a (in degrees)? 56.9 What is the shift in wavelength of the photon due to the scattering? How can you use momentum conservation in the horizontal and vertical directions to determine the angle? ° below the +x-axis (b) Determine the speed of the electron (in m/s). m/s

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Blackbody

Q.5 A blackbody radiates how much energy when the temperature of the body is elevated?