Why are measurements of the Sun's 10.7 cm radio emission used to monitor the state of the solar cycle? Choose all correct answers. A. It provides a repeatable, objective measurement of solar activity B. It serves as a good proxy for EUV emissions C. It is measured from space, so it is not affected by clouds D. It can be used to predict the occurrence of coronal mass ejections

Why are measurements of the Sun's 10.7 cm radio emission used to monitor the state of the solar cycle? Choose all correct answers. A. It provides a repeatable, objective measurement of solar activity B. It serves as a good proxy for EUV emissions C. It is measured from space, so it is not affected by clouds D. It can be used to predict the occurrence of coronal mass ejections

College Physics

1st Edition

ISBN:9781938168000

Author:Paul Peter Urone, Roger Hinrichs

Publisher:Paul Peter Urone, Roger Hinrichs

Chapter7: Work, Energy, And Energy Resources

Section: Chapter Questions

Problem 43PE: (a) Calculate the power per square meter reaching Earth's upper atmosphere from the Sun. (Take the...

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Why are measurements of the Sun's 10.7 cm radio emission used to monitor the state of the solar cycle? Choose allcorrect answers.A. It provides a repeatable, objective measurement of solar activityB. It serves as a good proxy for EUV emissionsC. It is measured from space, so it is not affected by cloudsD. It can be used to predict the occurrence of coronal mass ejections
a. Explain and solve the equation that explains the temperature deviation of a spherical gas cloud in mutual magnetism of its molecules and subject to the laws of thermodynamics.
a.Calculate the mass loss rate of the Sun M˙ due to the solar wind flow. Assume averageproperties of the solar wind of number density 6 protons cm−3, and a flow speed of 450 kms−1. Express your answer in units of both kg per year, and solar masses per year. b.Suppose the solar wind flow is perfectly radial. Calculate the expected rate of change ofsolar rotation frequency dω/dt at the present time, based on conservation of angular momentum. Give your answer in units of rad s−1 y−1(i.e., radians per second per year) and alsoin terms of fractional change per year, i.e., 1/ωdω/dt .Use a current solar rotation period of P = 25.38 days to calculate the current angularfrequency of rotation ω. The moment of inertia of a uniform sphere is 2/5 MR2. You canassume that the radius of the Sun is approximately constant, and the change in its momentof inertia due to the solar wind is only due to the mass loss. c.By observing the rotation period of stars similar to the Sun, it is inferred that their…
How are neutrinos observed? a. by using a large tank of cleaning fluid buried deep in beneath Earth’s surface b. by using spectral observations c. by using a radio receiver d. by using a Schmidt-Cassegrain focus e. by using a magneto-hydrodynamic detector
Q26-A(i). Define solar constant. Explain a process which converts light energy into electricity.
Solar scientists want to measure the temperature inside the sun by sending in probes. Imagine that temperature increases by 1 million◦C for every 10,000 km below the surface. A probe that can handle a temperature of x million degrees costs x³ million dollars. a. How much would it cost to measure the temperature 10,000 km down? b. How much would it cost to measure the temperature 100,000 km down? c. How much would it cost to measure the temperature 200,000 km down?
At midday when a black grain storage facility is directly under the Sun, it receives 1,025 W of solar power per square meter of surface from the Sun. If this hot surface loses energy only by radiation back into the atmosphere, what is its equilibrium temperature (in K)? You may use an emissivity of e=1 for a black surface. Submit Answer 1. George and Harold 2. Tree House Comix, Inc. 3. The Adventures of Captain Underpants 4. Mean Old Mr. Krupp 5. 6. 7. CHAPTERS 8. One Day Very, Very Soon Busted A Little Blackmail Crime and Punishment 9. Four-to-Six Weeks Later 10. The 3-D Hypno-Ring Fun with Hypnosis 12. Out the Window 11. 13. Bank Robbers 14. The Big Bang 15. Dr. Diaper 16. The Extremely Graphic Violence Chapter (in Flip-O-Rama) 17. 18. 19. Back to School 20. The End? The Escape To Make a Long Story Short 1 tab 5 6 17 21 29 35 39 45 47 51 57 61 67 73 79 99 107 108 117 caps lock option command command option control
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
(a) Calculate the power per square meter reaching Earth's upper atmosphere from the Sun. (Take the power output of the Sun to be 4.001026 W.) (b) Part of this is absorbed and reflected by the atmosphere, so that a maximum of 1.30 kW/m2 reaches Earth's surface. Calculate the area in km 2 of solar energy collectors needed to replace an electric power plant that generates 750 MW if the collectors convert an average of 2.00% of the maximum power into electricity. (This small conversion efficiency is due to the devices themselves, and the fact that the sun is directly overhead only briefly.) With the same assumptions, what area would be needed to meet the United States' energy needs (1.051020J) ? Australia's energy needs (5.41018J) ? China's energy needs (6.31019J) ? (These energy consumption values are from 2006.)
6. A 2 kg mass is dropped to the ground through a conducting loop. The mass starts 3 meters off the ground with zero velocity, and it lands with a velocity 7 meters/second. You may take g to be 9.8 m/s^2 and ignore all other forces than gravity and electricity + magnetism. How much energy did the conducting loop dissipate (release) as heat and how do you know?
2. Plasma oscillations in the ionosphere. The plasma density in the lower ionosphere has been measured during satellite reentry to be about a) 10¹8 m-³ at 50 km altitude, b) 10¹7 m-³ at 70 km and c) 10¹4 m²³ at 85 km. Use the formula for the electron plasma frequency to compute its numerical value for each of these three altitudes, AND state (we'll address this quantitatively later, when we get to EM wave propagation in plasmas) why the ionosphere is a relevant consideration for radio communications both on earth and between earth and interplanetary spacecraft.
Suppose 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?

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A. It provides a repeatable, objective measurement of solar activity
B. It serves as a good proxy for EUV emissions
C. It is measured from space, so it is not affected by clouds
D. It can be used to predict the occurrence of coronal mass ejections