# Hw11 - Version PREVIEW Hw11 Ross(10219 This print-out...

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Version PREVIEW – Hw11 – Ross – (10219) 1 This print-out should have 19 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. Serway CP 27 07 001 10.0 points An FM radio transmitter has a power output of 132 kW and operates at a frequency of 106 . 8 MHz. How many photons per second does the transmitter emit? Planck’s constant is 6 . 62607 × 10 - 34 J · s. Correct answer: 1 . 86529 × 10 30 . Serway CP 27 11 002 (part 1 of 3) 10.0 points When light of wavelength 376 nm falls on a potassium surface, electrons are emitted that have a maximum kinetic energy of 1 . 69 eV. What is the work function of potassium? The speed of light is 3 × 10 8 m / s and Planck’s constant is 6 . 63 × 10 - 34 J · s . Correct answer: 1 . 61618 eV. 003 (part 2 of 3) 10.0 points What is the cutoff wavelength of potassium? Correct answer: 769 . 173 nm. 004 (part 3 of 3) 10.0 points What is the threshold frequency for potas- sium? Correct answer: 3 . 90029 × 10 14 Hz.

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