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Q. A person with perfect pitch sits on a bus bench listening to the 450 Hz horn of an approaching car. If the person detects the frequency of 470 Hz, how fast is the car moving?

Q. When a clean surface of Sodium metal is exposed to blue light l = 486 nm, electrons are emitted. If the work function is 2.26 ev , What is the Kinetic energy of emitted electrons?

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