EBK THE COSMIC PERSPECTIVE
EBK THE COSMIC PERSPECTIVE
9th Edition
ISBN: 9780135161760
Author: Voit
Publisher: VST
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Chapter 5, Problem 57EAP

(a)

To determine

To Calculate: The energy of a single photon with the given wavelength.

(b)

To determine

To Find: The number of photons emitted per second by the given bulb.

(c)

To determine

To Explain: Particle nature of light is not observed in everyday life.

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A perfect black body has its surface temperature 27 cº Determine : Maximum radiation wavelength? Black body radiation intensity? The rate of energy released from 2m² Tungsten wire had its radiating surface area 8mm² and its temperature 2100K, considering that the wire is an ideal black body, Calculate the energy that the wire radiates in 10 minutes. Suppose the surface temperature of the Sun were about 12,000K, rather than 6000K. a. How much more thermal radiation would the Sun emit? b. What would happen to the Sun's wavelength of peak emission? c. Do you think it would still be possible to have life on Earth? Explain /A The energy radiated by a black body at 2300K is found to have the maximum at a wavelength 1260 nm, its emissive power being 8000W/m2. When the body is cooled to a temperature T K, the emissive power is found to decrease to 500W/m2. Find : (i) the temperature T k (ii) the wave length at which intensity of emission in maximum at the Te / Black body becomes yellow with λ…
You have two lightbulbs of different power and color, as indicated in (Figure 1). One is a 150-WW red bulb, and the other is a 40-WW blue bulb. Which bulb emits more photons per second? Which bulb emits photons of higher energy? Calculate the number of photons emitted per second by each bulb. Take λred=640nm�red=640nm and λblue=430nm�blue=430nm. (Most of the electromagnetic radiation given off by incandescent lightbulbs is in the infrared portion of the spectrum. For the purposes of this problem, however, assume that all of the radiated power is at the wavelengths indicated.)

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EBK THE COSMIC PERSPECTIVE

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