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exam 3 physics

# exam 3 physics - 1 The x-ray camera in my dentist's office...

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1. The x-ray camera in my dentist’s office produces electrons at 63.0 kilovolts. The photons are produced when these electrons are essentially “stopped” and give up their energy. a. Calculate the wavelength of the photons. b. If the pulse lasted 30.0 milliseconds and the ion current was 2.5 miliamps, how many photons did I get? 2. a. 110 Vac power source powers are RLC circuit. If the inductance is 0.45mH and the resistance is 75.0Ω to what setting must a variable capacitor be set so that power is added most efficiently if the frequency of the power source is 60.0 Hz. b. What would be the rms power added to the circuit at these settings? c. If you plug your device into a 110V/50.0Hz source what would be the new Prms added to the circuit

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3. You have a laser pointer and shine it onto a block of plastic a with a horizontal, smooth surface. Some of the photons reflect and some refract. The refractive index of the plastic is 1.40. At what angle above the horizontal must you point the laser toward the surface so that reflected ray is perpendicular to the refracted ray?
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