Introduction To Health Physics
5th Edition
ISBN: 9780071835275
Author: Johnson, Thomas E. (thomas Edward), Cember, Herman.
Publisher: Mcgraw-hill Education,
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Chapter 3, Problem 3.24P
To determine
The corresponding photon flux, in photons per square centimetre per second.
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Students have asked these similar questions
A particular star has a radius of 8.46 ✕ 108 m. The peak intensity of the radiation it emits is at a wavelength of 679 nm.
(a) What is the energy (in J) of a photon with this wavelength?
answer in J
(b) What is the star's surface temperature (in K)? (Round your answer to at least the nearest integer.)
answer in K
(c) At what rate (in W) is energy emitted from the star in the form of radiation? Assume the star is a blackbody, with emissivity
e = 1.
answer in W
(d) Using the results from parts (a) and (c), estimate the rate (in photons/s) at which photons are emitted by the star.
answer in photon/s
Solar radiation falls on Earth's surface at a
rate of 1900 W/m².
Assuming that the radiation has an average
wavelength of 580 nm, how many photons per
square meter per second fall on the surfaces?
The speed of light is 3 × 10° m/s and Planck's
constant is 6.62607 × 10-34 J. s.
Answer in units of photon/m² · s.
2
Suppose a star with radius 8.69 x 10° m has a peak wavelength of 684 nm in the spectrum of its emitted radiation.
(a) Find the energy of a photon with this wavelength.
0.029e-17
J/photon
(b) What is the surface temperature of the star?
4274.3
X K
(c) At what rate is energy emitted from the star in the form of radiation? Assume the star is a blackbody (e = 1).
1.9934e17
Your response differs significantly from the correct answer. Rework your solution from the beginning and check each
step carefully. W
(d) Using the answer to part (a), estimate the rate at which photons leave the surface of the star.
X photons/s
Chapter 3 Solutions
Introduction To Health Physics
Ch. 3 - Prob. 3.1PCh. 3 - Prob. 3.2PCh. 3 - Prob. 3.3PCh. 3 - Prob. 3.4PCh. 3 - Calculate the current due to the hydrogen electron...Ch. 3 - Prob. 3.6PCh. 3 - Prob. 3.7PCh. 3 - Prob. 3.8PCh. 3 - Prob. 3.9PCh. 3 - Prob. 3.10P
Ch. 3 - Prob. 3.11PCh. 3 - Prob. 3.12PCh. 3 - Prob. 3.14PCh. 3 - Prob. 3.15PCh. 3 - Prob. 3.16PCh. 3 - Prob. 3.17PCh. 3 - Prob. 3.18PCh. 3 - Prob. 3.19PCh. 3 - Prob. 3.20PCh. 3 - Prob. 3.21PCh. 3 - Prob. 3.22PCh. 3 - If 9 g of NaC1 were dissolved in 1 L of water,...Ch. 3 - Prob. 3.24PCh. 3 - What is the binding energy of the last neutron in...Ch. 3 - Prob. 3.26PCh. 3 - Prob. 3.27PCh. 3 - Prob. 3.28PCh. 3 - Prob. 3.29PCh. 3 - Prob. 3.30PCh. 3 - Prob. 3.31PCh. 3 - Prob. 3.32PCh. 3 - What is the binding energy of the last neutron in...Ch. 3 - Prob. 3.34PCh. 3 - Prob. 3.35PCh. 3 - Prob. 3.36PCh. 3 - Prob. 3.37PCh. 3 - Prob. 3.38PCh. 3 - Prob. 3.39PCh. 3 - Prob. 3.40PCh. 3 - Prob. 3.41P
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- An infrared satellite measures outgoing radiation that leaves Earth's surface through an atmospheric window. The observed spectral irradiance at a wavelength of 10 μm is 2.199×107 W m-2 m-1. What is the temperature of the surface? Give your answer in K.arrow_forwardFind the energy of the following. Express your answers in units of electron volts, noting that 1 eV = 1.60 x 10-19 J. (a) a photon having a frequency of 3.40 x 1017 Hz 1.41e-31 Calculate the energy of a photon at the given frequency and express your answer in electron volts. eV (b) a photon having a wavelength of 8.20 x 102 nm 2.43e-29 Calculate the frequency of light corresponding to the given wavelength and from the frequency calculate the energy of a photon with that wavelength. eVarrow_forward(a) How many minutes does it take a photon to travel from the Sun to the Earth? min (b) What is the energy in ev of a photon with a wavelength of 478 nm? ev (c) What is the wavelength (in m) of a photon with an energy of 1.03 eV?arrow_forward
- 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.arrow_forwardVisible light having a wavelength of 6.0 x 10-7 m appears orange. Compute the following using scientific notation and 3 significant digits. (a) the frequency V= i5*10^14 (b) the energy of a photon of this light E= 6.63*10^-34 S-1 Jarrow_forwardA photon has an energy of 2.44x10^-22 J. What is its frequency?arrow_forward
- The average threshold of dark-adapted (scotopic) vision is 4.00 x 10-11 W/m? at a central wavelength of 500 nm. If light having this intensity and wavelength enters the eye and the pupil is open to its maximum diameter of 8.50 mm, how many photons per second enter the eye?arrow_forward(a) Find the energy of a photon having a frequency of 5.00 x 1017 Hz. Express your answers in units of electron volts (1 eV = 1.60 x 10-19 J.) 2,465.5 keV 1,345.4 keV 1,149.9 keV 2,071.9 keV (b) a photon having a wavelength of 5.00 x 102 nm. Express your answers in units of electron volts, ( 1 eV = 1.60 x10-19 J.) 2.49 eV 3.53 eV 4.62 eV 6.98 eVarrow_forwardThe electrons of a particular atom rearrange over a period of about 1 nanosecond and the process is accompanied by the emission of a photon with energy 2.04 eV. How many wavelengths long is the photon? Select an answer and submit. For keyboard navigation, use the up/down arrow keys to select an answer. a b с d 2 x 10-6 0.3 606 of the order 1 millionarrow_forward
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