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 2, Problem 2.32P
To determine
The electric and magnetic field strengths corresponding to the solar constant, the mean value for the solar constant is
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2. The wavelength of maximum intensity of the sun's radiation is observed to be near
500 nm. Assume the sun to be a black-body and calculate,imsed of
(a) the sun's surface temperature
(b) the power per unit area (intensity) emitted from he sun's surface.
(c) At what rate is the sun losing mass in units of kg/s? (Hint: What are the units from
rignslavaw wert odrai Jari W (d)
your answer in part (b)?)
(d) At that rate, how much time would it take to exhaust the sun's fuel supply? Does
your answer seem reasonable? (The sun's mass is ~2.0x1030 kg)
B2. A spherical star is detected by an astronaut in a spacecraft at a distance z of 1.5×10¹2
kilometers. The star can be regarded as a blackbody with a temperature of 11,300 K. The
radius r of the star is 3.5×106 kilometers.
(a) Calculate the radiant exitance and the radiant intensity of the star.
(b) Calculate the irradiance that can be detected by the astronaut.
(c) The photodetector used by the astronaut in the spacecraft has a responsivity of 120 kV/W
and an photosensitive area of 0.5 mm². Calculate the output voltage of the detector in the
detection of the star.
CAMINS
+II+
Figure B2
1) Determine the day of the year where the solar irradiance outside
the Earth's atmosphere is equal to 1384 W/m ,suppose that the
value of the solar constant (Hconstant) is 1.353 kW/m2.
2) Determine the day of the year where the declination angle is 15
degree
Chapter 2 Solutions
Introduction To Health Physics
Ch. 2 - Two blocks of mass 0.1 kg and 0.2 kg approch each...Ch. 2 - A bullet whose mass is 50 g travels at a velocity...Ch. 2 - Compute the mass of the Earth, assuming it to be a...Ch. 2 - An automobile weighing 2000 kg and going at a...Ch. 2 - A small electrically charged sphere of mass 0.1 g...Ch. 2 - A capacitor has a capacitance of 10F . How much...Ch. 2 - A small charged particle whose mass is 0.01 g...Ch. 2 - Prob. 2.8PCh. 2 - Prob. 2.9PCh. 2 - Prob. 2.10P
Ch. 2 - Prob. 2.11PCh. 2 - Prob. 2.12PCh. 2 - Prob. 2.13PCh. 2 - Prob. 2.14PCh. 2 - Prob. 2.15PCh. 2 - A current of 25 mA flows through a 25-gauge wire,...Ch. 2 - An electron starts at rest on the negative plate...Ch. 2 - Prob. 2.18PCh. 2 - Prob. 2.19PCh. 2 - Prob. 2.20PCh. 2 - Prob. 2.21PCh. 2 - Prob. 2.22PCh. 2 - Prob. 2.23PCh. 2 - (a) A 1000-MW(e) nuclear power plant operates at a...Ch. 2 - Prob. 2.25PCh. 2 - Prob. 2.26PCh. 2 - Prob. 2.27PCh. 2 - The specific heat of water in the English system...Ch. 2 - Prob. 2.29PCh. 2 - Prob. 2.30PCh. 2 - Prob. 2.31PCh. 2 - Prob. 2.32PCh. 2 - How many cubic meters of water must fall over a...Ch. 2 - (a) Calculate the speed of a 25-MeV proton. (b)...Ch. 2 - Prob. 2.35PCh. 2 - Prob. 2.36PCh. 2 - Calculate the speed of a (a) 0.5-MeV electron and...Ch. 2 - How much sub-butuminous coal (20,000 kJ/kg) would...Ch. 2 - Prob. 2.40PCh. 2 - How much oil (138,690 Btu/gal) would it take to...Ch. 2 - How much oil (138,690 Btu/gal) would it take to...Ch. 2 - Prob. 2.43PCh. 2 - Prob. 2.44PCh. 2 - Prob. 2.45PCh. 2 - Prob. 2.46PCh. 2 - Prob. 2.47PCh. 2 - Prob. 2.48PCh. 2 - Prob. 2.49P
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- Taverage = 288 degrees kelvin Source_ ase.tufts.edu Q12 Estimate dmaxjatensity, based on Earth's surface temperature using Wien's Law in Figure 1-3. dmax jntensity = Q13 Estimate kmax iuteusiy, based on Earth's surface temperature using Wien's Law kmax iutensity =. Q14 What region of the EM spectrum does Amax intensity, emitted by Earth, belong to? Aside: Can the human eye detect this radiation?arrow_forward19. A hydrogen atom in excited energy state E24x 10" drops down to the ground state at energy level E 21.76 x 10"), giving off a photon. a. What is the energy of the emitted photon injoules? b. What is its wavelength? c. Based on the EM spectrum, what type of raciation is this?arrow_forwardSuppose YOUR body temperature averages 98.6 F. 1. How much radiant energy in Wm^-2 is emitted from YOUR body? 2. What is the total radiant energy in W that is emitted from YOUR body? 3. At what wavelength does YOUR body emit the largest amount of radiant energy?arrow_forward
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