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# HW1answers pg5 - 8 m s 9 91 × 10 7 Hz = 3 02725 m 023(part...

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3. Electromagnetic radiation with a wave- length of 600 nm travels faster than that with a wavelength of 400 nm. 4. Electromagnetic radiation with a wave- length of 400 nm has a frequency that is lower than that with a wavelength of 600 nm. 5. Electromagnetic radiation with a wave- length of 400 nm travels faster than that with a wavelength of 600 nm. Explanation: v = f λ , so λ = 1 f . Higher wavelengths cor- respond to lower frequencies, and vice versa . 022 (part 1 of 1) 10 points What is the wavelength of a radio station transmitting at 99.1 MHz? 1. 303 nm 2. 330 nm 3. 0.330 m 4. 0.00303 m 5. 3.03 m correct Explanation: μ = 99 . 1 MHz = 9 . 91 × 10 7 Hz c = ν λ λ = c ν
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Unformatted text preview: 8 m / s 9 . 91 × 10 7 Hz = 3 . 02725 m 023 (part 1 of 1) 10 points In 1.0 s, a 60 W bulb emits 11 J of energy in the form of infrared radiation (heat) of wavelength 1850 nm. How many photons of infrared radiation does the lamp generate in 1.0 s? 1. 1 . 10 × 10-19 photons 2. 6 . 63 × 10 23 photons 3. 6 . 82 × 10-14 photons 4. 1 . 02 × 10 20 photons correct 5. 1 . 04 × 10 29 photons Explanation: E = h c λ = (6 . 626 × 10-34 J · s) (3 × 10 8 m / s) 1 . 85 × 10-6 m = 1 . 07449 × 10-19 J # photons = 11 J 1 . 07449 × 10-19 J = 1 . 02374 × 10 20 photons...
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