COLLEGE PHYSICS
2nd Edition
ISBN: 9781464196393
Author: Freedman
Publisher: MAC HIGHER
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Question
Chapter 22, Problem 17QAP
To determine
The number of photons per seconds emitted inside a household microwave oven.
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The energy flux of sunlight reaching the surface of the earth is 1.388 x 10³ w/m?. How
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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
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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.
Chapter 22 Solutions
COLLEGE PHYSICS
Ch. 22 - Prob. 1QAPCh. 22 - Prob. 2QAPCh. 22 - Prob. 3QAPCh. 22 - Prob. 4QAPCh. 22 - Prob. 5QAPCh. 22 - Prob. 6QAPCh. 22 - Prob. 7QAPCh. 22 - Prob. 8QAPCh. 22 - Prob. 9QAPCh. 22 - Prob. 10QAP
Ch. 22 - Prob. 11QAPCh. 22 - Prob. 12QAPCh. 22 - Prob. 13QAPCh. 22 - Prob. 14QAPCh. 22 - Prob. 15QAPCh. 22 - Prob. 16QAPCh. 22 - Prob. 17QAPCh. 22 - Prob. 18QAPCh. 22 - Prob. 19QAPCh. 22 - Prob. 20QAPCh. 22 - Prob. 21QAPCh. 22 - Prob. 22QAPCh. 22 - Prob. 23QAPCh. 22 - Prob. 24QAPCh. 22 - Prob. 25QAPCh. 22 - Prob. 26QAPCh. 22 - Prob. 27QAPCh. 22 - Prob. 28QAPCh. 22 - Prob. 29QAPCh. 22 - Prob. 30QAPCh. 22 - Prob. 31QAPCh. 22 - Prob. 32QAPCh. 22 - Prob. 33QAPCh. 22 - Prob. 34QAPCh. 22 - Prob. 35QAPCh. 22 - Prob. 36QAPCh. 22 - Prob. 37QAPCh. 22 - Prob. 38QAPCh. 22 - Prob. 39QAPCh. 22 - Prob. 40QAPCh. 22 - Prob. 41QAPCh. 22 - Prob. 42QAPCh. 22 - Prob. 43QAPCh. 22 - Prob. 44QAPCh. 22 - Prob. 45QAPCh. 22 - Prob. 46QAPCh. 22 - Prob. 47QAPCh. 22 - Prob. 48QAPCh. 22 - Prob. 49QAPCh. 22 - Prob. 50QAPCh. 22 - Prob. 51QAPCh. 22 - Prob. 52QAPCh. 22 - Prob. 53QAPCh. 22 - Prob. 54QAP
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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_forwardThe 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/sarrow_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 is a complex sensing device for visible light. The optic nerve needs a minimum of 2.0 10-17 J of energy to trigger a series of impulses that eventually reach the brain. (a) How many photons of red light (670. nm) are needed? photons(b) How many photons of blue light (470. nm) are needed?arrow_forwardA dental X-ray typically affects 194 g of tissue and delivers about 3.6 µJ of energy using X-rays that have wavelengths of 0.025 nm. What is the energy Ephoton, in electron volts, of X-ray photons? eV Ephoton = How many photons are absorbed during the dental X-ray? Assume the body absorbs all of the incident X-rays. photons number of photons absorbed:arrow_forwardThe threshold of dark-adapted (scotopic) vision is 4.5 x 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 9.0 mm, how many photons per second enter the eye? Xarrow_forward
- The human eye is a complex sensing device for visible light. The optic nerve needs a minimum of 2.0*10^-17 J of energy to trigger a series of impulses that eventually reach the brain. How many photons of red light (700nm) are needed? How many photons of blue light(475 nm) are needed? Remember, E=hv allows calculation of the energy of a single photonarrow_forwardA 193-nm-wavelength UV laser for eye surgery emits a 0.500 mJ pulse. How many photons does the light pulse contain?arrow_forwardA glass plate has a mass of 0.50 kg and a specific heat capacity of 840 J/(kg-C). The wavelength of infrared light is 14 x 10 m, while the wavelength of blue light is 4.7 x 107m. Find the number of infrared photons and the number of blue photons needed to raise the temperature of the glass plate by 2.0 °C, assuming that all the photons are absorbed by the glass. Nudrored Number Units Nyisible - Number Unitsarrow_forward
- The human eye is a complex sensing device for visible light. The optic nerve needs a minimum of 2.0 10-17 J of energy to trigger a series of impulses that eventually reach the brain. (a) How many photons of red light (670. nm) are needed? photons(b) How many photons of blue light (470. nm) are needed? (include significant figures)arrow_forwardThe intensity of electromagnetic radiation from the sun reaching the earth’s upper atmosphere is 1.37 kW/m2. Assuming an average wavelength of 680 nm for this radiation, find the number of photons per second that strike a 1.00 m2 solar panel directly facing the sun on an orbiting satellite.arrow_forwardA dental X-ray typically affects 195 g of tissue and delivers about 3.85 µJ of energy using X-rays that have wavelengths of 0.0255 nm. What is the energy in electron volts of a single photon of these X-rays? energy of a photon: How many photons are absorbed during the dental X-ray? number of photons absorbed: eV photonsarrow_forward
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