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Solve the given problem:
Problem: The gap between valence and conduction bands in silicon is 1.12 eV. A nickel nucleus in an excited state emits a gamma-ray photon with wavelength 9.31 x 10-4 nm.
Part I: How many electrons can be excited from the top of the valence band to the bottom of the conduction band by the absorption of this gamma ray?
Please keep solution simple and short and please don't copy and paste.
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Suppose unpolarized light of intensity 150 W/m^2 falls on the polarizer and the angle is 30 degrees. What is the light intensity reaching the photocell?
A 12 kg runaway grocery cart runs into a spring with spring constant 240 N/m and compresses it by 60 cm. What was the speed of the cart just before it hit the spring?
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