Universe
11th Edition
ISBN: 9781319039448
Author: Robert Geller, Roger Freedman, William J. Kaufmann
Publisher: W. H. Freeman
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Chapter 5, Problem 29Q
To determine
If a red source of light must emit more photons than a blue source of light to produce the same amount of light energy per second.
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Chapter 5 Solutions
Universe
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- Which produces a shorter wavelength of light: an electron jumping from a hydrogen atom’s 6th energy level to its 2nd energy level, or one jumping from the 3rd to the 2nd energy level? Explain your answer.arrow_forwardThe human eye is most sensitive to light of wavelength 5.50 x 10^-7 m which is the green yellow region of the visible electromagnetic spectrum. (Frequency is 5.45 x 10 ^14 Hz, wavelength is 0.550 microns). Where is this wavelength with respect to the center of the blackbody emission spectrum of the sun's radiation at 0.495 microns, and how did this come about?arrow_forwardSuppose YOUR body temperature averages 98.6 F. 1. How much radiant energy in Wm^-2 is emitted from YOUR body? 2. What is the total radiant energy in W that is emitted from YOUR body? 3. At what wavelength does YOUR body emit the largest amount of radiant energy?arrow_forward
- a) To which object corresponds this spectrum to? b) What is the source of radiation for each of the two humps? c) Why does the hump on the right hand side peak at higher wavelength than the hump on the left? [Specifically, what does this tell you about the temperature for each object that the light originates from?]arrow_forwardWhen astronomers look at the spectrum of the Sun, they noticed that the light from one edge is slightly blue-shifted, while light from the opposite age is slightly red-shifted. What does this tell you about the Sun?arrow_forwardA blue-hot star is about twice as hot as a red-hot star. But the temperatures of the gases in advertising signs are about the same, whether they emit red or blue light. What is your explanation?arrow_forward
- If you see a red-hot star, you can be certain that its peak intensity is in the infrared region. Why is this?arrow_forwardLook up the wavelengths of the spectral lines of hydrogen, and the nomenclature used to label these lines. Identify the hydrogen lines in the solar spectrum over the range shown below.arrow_forwardHow many watts of radiation does a 1-meter-square region of the Sun’s spot emit, at a temperature of 5000 K? How much would the wattage increase if the temperature of the spot were twice as much, 10 000 K?arrow_forward
- In the graph below, the yellow region shows the AM 1.5 solar spectrum. The area indicated by the blue area represents the AM 1.0 spectrum. The boundaries of the AM 1.0 spectrum; When λ = between 250nm and 1000nm Pλ = 1x109Wm^(-2) m^(-1) When λ = between 1000nm and 2000nm Pλ = 0.25x109W m^(-2) m^(-1) In that case; a-) Find the radiation intensity (I) and photon flux () for AM 1.0. b-) If the radiation intensity in the option a comes to the silicon solar cell with a band gap of 1.12eV, how much will the photo-current be produced?arrow_forwardUse Wien's Law to calculate the peak wavelength of light coming from the Sun. Assume T=5800 K for the surface temperature of the Sun. Wein's displacement law says that the blackbody temperature and peak wavelength multiplied together give a constant of 0.29 cm-K. (K is degrees Kelvin). Convert the wavelength from part A into a frequency. The product of wavelength and frequency for electromagnetic radiation is a constant, the speed of light (c), 3 x 10^10 cm/s.arrow_forwardContinuing the thinking in Exercise 29.27 and Exercise 29.28, calculate the energy in a cubic meter of space, multiply the energy per photon calculated in Exercise 29.26 by the number of photons per cubic meter given above.arrow_forward
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