In the context of the Sun, which of the following statements is true of electromagnetic radiation?
A) Protons cannot make electromagnetic radiation.
B) Electromagnetic radiation is usually made by electrons.
C) Electromagnetic radiation is made when most of the electrons in the Sun are static.
D) The presence of isotopes in the Sun causes the emission of electromagnetic radiation.
B
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A liquid boils when its vapor pressure
A) equals the equilibrium vapor pressure. B) equals the external pressure. C) exceeds the external pressure. D) is between the equilibrium vapor pressure and the external pressure. E) None of the other choices is correct.
Faraday's Law: As shown in the figure, a uniform magnetic field B is confined to a cylindrical volume of radius 0.050 m. This field is directed into the plane of the page and is increasing at a constant rate of 0.900 T/s. Calculate the magnitude and direction (clockwise or counterclockwise) of the current induced in a circular wire ring of radius 0.16 m and resistance 7.1 ? that encircles the magnetic field region.
What will be an ideal response?
Two thermometers are calibrated, one in degrees Celsius and the other in degrees Fahrenheit. At what temperature (in kelvins) do their readings measure the same temperature?
a. 218.15 b. 233.15 c. 273.15 d. 40.15 e. 0
The dark spots in this photo (such as the one indicated by the arrow) represent what we call
A) sunspots. B) convection zones. C) coronal holes. D) solar prominences. E) Great Dark Spots.