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Q. What wavelength light would have to fall on sodium (with a work function of 2.46 eV) if it is to emit electrons with a maximum speed of 1.60 multiplied by 106 m/s?

Q. As part of a safety investigation, two 1900 cars traveling at 23 are crashed into different barriers. Find the average forces exerted on (a) the car that hits a line of water barrels and takes 1.5 to stop, and (b) the car that hits a concrete barrier and takes 0.5 to stop.

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