Modern Physics
2nd Edition
ISBN: 9780805303087
Author: Randy Harris
Publisher: Addison Wesley
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Question
Chapter 3, Problem 50CE
(a)
To determine
ToCalculate: The number of photons per second emanated from the flash light.
(b)
To determine
ToCalculate:The force that the beam wouldexert on a “perfect” mirror.
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Students have asked these similar questions
(a) If the power output of a 670 kHz radio station is 49.0 kW, how many photons per second are produced?
1.1679e32 X
How does power relate to energy? Review the relationship between energy and frequency of a photon. photons/s
(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 125 km. Assume no reflection from the ground or absorption by the air.
2.138e21
If there is no reflection by the ground, what fraction of the radiated power reaches the receiver? What portion of the
spherical surface do you need to consider here? photons/(s · m2)
Additienel Mete niel
A helium–neon laser produces a beam of diameter 1.75 mm, delivering 2.00 × 1018 photons/s. Each photon has a wavelength of 633 nm. Calculate the amplitudes of (a) the electric fields and (b) the magnetic fields inside the beam. (c) If the beam shines perpendicularly onto a perfectly reflecting surface, what force does it exert on the surface? (d) If the beam is absorbed by a block of ice at 0°C for 1.50 h, what mass of ice is melted?
A regular LED light bulb continuously emits 10.0 W of light uniformly in all directions. A man stands so that
his eyes are 5.00 m away from this light bulb and he is looking directly at the light bulb. There are no other
sources of light in this room. (a) What is the irradiance of this light in W/m2 just before entering this man's
eyes? (b) If each pupil of this man is contracted to a radius of 2.00 mm, what is the total power in W of the
light entering each eye? (c) A human receives 3300 J of usable energy after eating one blueberry. How long
would this man have to stare at this light bulb in order to take into his eyes through the pupils the same
amount of energy as eating a blueberry? Don't forget that he has two eyes! (Note that far more energy from
the light is hitting his skin, but that is not what we care about here.)
Chapter 3 Solutions
Modern Physics
Ch. 3 - Prob. 1CQCh. 3 - Prob. 2CQCh. 3 - Prob. 3CQCh. 3 - Prob. 4CQCh. 3 - Prob. 5CQCh. 3 - Prob. 6CQCh. 3 - Prob. 7CQCh. 3 - A ball rebounds elastically from the floor. What...Ch. 3 - Prob. 9CQCh. 3 - Prob. 10CQ
Ch. 3 - Prob. 11ECh. 3 - Prob. 12ECh. 3 - Prob. 13ECh. 3 - Prob. 14ECh. 3 - Prob. 15ECh. 3 - Prob. 16ECh. 3 - Prob. 17ECh. 3 - What is the stopping potential when 250 nm...Ch. 3 - Prob. 19ECh. 3 - Prob. 20ECh. 3 - Prob. 21ECh. 3 - Prob. 22ECh. 3 - Prob. 23ECh. 3 - Prob. 24ECh. 3 - Prob. 25ECh. 3 - Prob. 26ECh. 3 - Prob. 27ECh. 3 - Prob. 28ECh. 3 - Prob. 29ECh. 3 - Prob. 30ECh. 3 - Prob. 31ECh. 3 - Prob. 32ECh. 3 - Prob. 33ECh. 3 - Prob. 34ECh. 3 - Prob. 35ECh. 3 - Prob. 36ECh. 3 - Verify that the Chapter 2 formula KE=mc2 applies...Ch. 3 - Prob. 38ECh. 3 - Prob. 39ECh. 3 - Prob. 40ECh. 3 - Prob. 41ECh. 3 - Prob. 42ECh. 3 - Prob. 43ECh. 3 - Prob. 44ECh. 3 - Prob. 45ECh. 3 - Prob. 46ECh. 3 - Prob. 47CECh. 3 - Prob. 49CECh. 3 - Prob. 50CECh. 3 - Prob. 51CECh. 3 - Prob. 52CECh. 3 - Prob. 53CECh. 3 - Prob. 54CECh. 3 - Prob. 55CE
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- (a) A certain X-ray photon has a wavelength of 18 nm. Calculate the frequency (υ) of this type of radiation. The speed of light, c = 2.998 x 108 m/s (b) Do you expect the frequency of photon of blue color light to be greater than, less than, or the same as the frequency of this X-ray photon? Explain your reasoning.arrow_forwardA spectral emission line is electromagnetic radiation that is emitted in a wavelength range narrow enough to be taken as a sin-gle wavelength. One such emission line that is important in astronomy has a wavelength of 21 cm.What is the photon energy in the electromagnetic wave at that wavelength?arrow_forward(a) 620 nanometers (nm)? (b) What are the energy and momentum of a photon of red light of wavelength What is the wavelength (in nm) of photons of energy 2.40 eV? 1.arrow_forward
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