Integrated Science
7th Edition
ISBN: 9780077862602
Author: Tillery, Bill W.
Publisher: Mcgraw-hill,
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Chapter 7, Problem 7PEA
To determine
The number of photons arriving each second on solar collector.
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energy flux of sunlight reaching the surface of
the earth is 1.388 x 10^3 W/m^2. How many
photons (nearly) per square meter are incident
on the Earth per second? Assume that the
photons in the sunlight have an average
wavelength of 550 nm.
The energy flux of sunlight reaching the surface of the earth is 1.388 x 10³ w/m?. How
many photons (nearly) per square metre are incident on the Earth per second? Assume
that the photons in the sunlight have an average wavelength of 550 nm.
The threshold of dark-adapted (scotopic) vision is 2.8 ✕ 10−11 W/m2 at a central wavelength of 500 nm. If light with this intensity and wavelength enters the eye when the pupil is open to its maximum diameter of 8.4 mm, how many photons per second enter the eye? _________photons/s
Chapter 7 Solutions
Integrated Science
Ch. 7.1 - Prob. 1SCCh. 7.1 - Prob. 2SCCh. 7.1 - Prob. 3SCCh. 7.2 - Prob. 4SCCh. 7.2 - Prob. 5SCCh. 7.2 - Prob. 6SCCh. 7.2 - Prob. 7SCCh. 7.3 - Prob. 8SCCh. 7.3 - Prob. 9SCCh. 7.4 - Prob. 10SC
Ch. 7.4 - Prob. 11SCCh. 7.5 - Prob. 12SCCh. 7 - What determines if an electromagnetic wave emitted...Ch. 7 - Prob. 2CQCh. 7 - Prob. 3CQCh. 7 - Prob. 4CQCh. 7 - Prob. 5CQCh. 7 - Prob. 6CQCh. 7 - Prob. 7CQCh. 7 - Prob. 8CQCh. 7 - Prob. 9CQCh. 7 - Prob. 10CQCh. 7 - Prob. 11CQCh. 7 - Prob. 12CQCh. 7 - Prob. 13CQCh. 7 - Prob. 14CQCh. 7 - Prob. 15CQCh. 7 - Prob. 16CQCh. 7 - Prob. 17CQCh. 7 - Prob. 18CQCh. 7 - Prob. 1PEACh. 7 - Prob. 2PEACh. 7 - Prob. 3PEACh. 7 - Prob. 4PEACh. 7 - Prob. 5PEACh. 7 - Prob. 6PEACh. 7 - Prob. 7PEACh. 7 - Prob. 8PEACh. 7 - Prob. 9PEACh. 7 - Prob. 10PEACh. 7 - Prob. 1PEBCh. 7 - Prob. 2PEBCh. 7 - Prob. 3PEBCh. 7 - Prob. 4PEBCh. 7 - Prob. 5PEBCh. 7 - Prob. 6PEBCh. 7 - Prob. 7PEBCh. 7 - Prob. 8PEBCh. 7 - Prob. 9PEBCh. 7 - Prob. 10PEB
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- (a) What is the ratio of power outputs by two microwave ovens having frequencies of 950 and 2560 MHz, if they emit the same number of photons per second? (b) What is the ratio of photons per second if they have the same power output?arrow_forwardA 900-W microwave generator in an oven generates energy quanta of frequency 2560 MHz. (a) How many energy quanta does it emit per second? (b) How many energy quanta must be absorbed by a pasta dish placed in the radiation cavity to increase its temperature by 45.0 K? Assume that the dish has a mass of 0.5 kg and that its specific heat is 0.9 kcal/kg • K. (c) Assume that all energy quanta emitted by the generator are absorbed by the pasta dish. How long must we wait until the dish in (b) is ready?arrow_forward(a) Calculate the wavelength of a photon that has the same momentum as a proton moving at 1.00% of the speed of light. (b) What is the energy of the photon in MeV? (c) What is the kinetic energy of the proton in MeV?arrow_forward
- (a) If the power output of a 650-kHz radio station is 50.0 kW, how many photons per second are produced? (b) If the radio waves are broadcast uniformly in all directions, find the number of photons per second per square meter at a distance of 100 km. Assume no reflection from the ground or absorption by the air.arrow_forward(a) Calculate the number of photoelectrons per second that are ejected from a 1.00-mm2 area of sodium metal by a 500-nm radiation with intensity I .30kW/m2 (the intensity of sunlight above Earth’s atmosphere). (b) Given the work function of the metal as 2.28 eV, what power is carried away by these photoelectrons?arrow_forwardThe energy flux of sunlight reaching the surface of the earth is 1.388 × 103 W/m2. How many photons (nearly) per square metre are incident on the Earth per second? Assume that the photons in the sunlight have an average wavelength of 550 nm.arrow_forward
- The intensity of the sunlight reaching the Earth's surface is 1268 W/m2 and the average wavelength of the sunlight is 550 nm. (A) Energy of each photon = (B) Number of photons in the sunlight reaching the Earth's surface per square meter per second = (C) Energy deposited on a solar-panel of size 3.4 m x 2 m per second = (D) Energy converted to electricity per second by this solar-panel if its efficiency is 27.4% =arrow_forwardSuppose a linear accelerator (linac) creates a X-ray beam where every individual photon has an energy of 19 MeV. If 3x1010 photons are produced over 90x10-15 s, as measured through an area of 3.1 m², determine the intensity of the X-ray beam. I = B W/m²arrow_forwardThe average threshold of dark-adapted (scotopic) vision is 4.00 10-11 W/m2 at a central wavelength of 500 nm. If light with this intensity and wavelength enters the eye and the pupil is open to its maximum diameter of 9.00 mm, how many photons per second enter the eye? photons/sarrow_forward
- The human eye can barely detect a star whose intensity at the earth’s surface is 1.6 x 10-11 W/m2. If the dark-adapted eye has a pupil diameter of 7.0 mm, how many photons per second enter the eye from the star? Assume the starlight has a wavelength of 550 nm.arrow_forwardA 117.0W lightbulb emits about 7.45W of visible light. (The other 109.55W are emitted as infrared radiation or lost as heat to the surroundings.) The average wavelength of the visible light is about 570.0nm, so make the simplifying assumption that all the visible light has this wavelength. What is the frequency of the emitted visible light? How many visible-light photons does the bulb emit per second?arrow_forwardA flashlight emits 1.0W of light energy. Assuming a frequency of 5.2 x 10^14 Hz for the light, determine the number of photons given off by the flashlight per second.arrow_forward
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