PHYSICS F/SCI.+ENGR.,CHAPTERS 1-37
5th Edition
ISBN: 9780134378060
Author: GIANCOLI
Publisher: RENT PEARS
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Chapter 44, Problem 2Q
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The aftermath situation of the stars when it begins to generate more energy than it
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PHYSICS F/SCI.+ENGR.,CHAPTERS 1-37
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- Using data from the previous problem, find the increase in rotational kinetic energy, given the core’s mass is 1.3 times that of our Sun. Where does this increase in kinetic energy come from?arrow_forwardThe sun has a radius of 6.959 × 108 m and a surface temperature of 5.81 x 10° K. When the sun radiates at a rate of 3.91 x 1026 W and is a perfect emitter. What is the rate of energy emitted per square meter? Stefan-Boltzmann constant is 5.67 x 10-8 J/s-m2 K4 a) 5.6 x 107 W/m2 b) 12.8 x 107 W/m2 c) 6.4 x 107 W/m2 25.6 x 107 W/m2 5.6 x 1017 W/m2arrow_forwardB2. 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 B2arrow_forward
- 3 E As a star becomes a giant, its outer layers are expanding and the pressure consequently drops in the outer atmosphere. Where does the energy for expanding these layers come from? O from a magnetic dynamo effect in the star's outer layers, caused by a much stronger magnetic field inside the star O from the fusion of hydrogen into helium in a shell around the core O from an explosion in the core O from the fusion of helium into carbon in the core. O from the long-term fusion of hydrogen into helium in the core C F3 44 $ R 49 F F4 ww V DII FS % Q Search 5 T G * A 6 B F6 H F7 & 7 U N PrtScn F8 8 Home 3 9 K End F10 PgUp FI O Larrow_forwardIf a star has a surface temperature of 5000 K what will the maximum wavelength emitted by the star be?arrow_forwardAssuming that the Sun is a blackbody with a temperature of 6,000 K, at what wavelength does it radiate the most energy? [4.8 x 10‐7 m]arrow_forward
- Suppose we detect red photons at 656 nm emitted by electrons dropping from the n = 3 to the n = 2 orbital in hydrogen. The hydrogen is in an interstellar cloud at 5000k. If the cloud were heted to 10000 K, what would be the wavelength of the photons emitted by the transition? a) 328 nm b) 656 nm c) 1312 nm d) 658 nm e) 654 nmarrow_forwardTemperatures of two stars are in ratio 3:2. If wavelength of maximum intensity of first body is 4000 Å, what is corresponding wavelength of second body?a) 9000 Åb) 6000 Åarrow_forward1. What happens to energy from the Sun when it reaches Earth?arrow_forward
- What is the rate of thermal radiation emitted from a star with a radius of 2.310 x 109 m anda surface temperature of 8,420 K? Assume that the spherical surface behaves as a blackbody radiator.[Surface Area of a sphere = 4rr?: Area of a circle = Mr? or (Tt/4)d21arrow_forward2. What kind of reactions provide a star with energy?arrow_forward6) How many 60 Watt bulbs would it take to equal the luminosity of the Sun? a. 1000 b. 2.4 X 10^26 c. 2.4 X 10^28 d. 6.67 X 10^26 e. 6.67 X 10^24arrow_forward
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