All of the following statements about the Sun's corona are true. Which one explains why it is a source of X-rays?
A) The temperature of the corona's gas is some 1 to 2 million Kelvin.
B) The corona lies above the visible surface of the Sun.
C) The corona's gas consists mostly of hydrogen and helium.
D) The corona's structure is largely shaped by magnetic fields.
A
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Spectral Series: What is the shortest wavelength in the Balmer series?
A. 328 nm B. 365 nm C. 456 nm D. 656 nm E. 820 nm
When astronomers study the light emitted from the Sun they notice that the light emitted from the east limb (edge) is blueshifted while the light emitted from the west limb is redshifted. The reason for this is that
A. the Sun is rotating. B. the Sun contains different chemicals that emit different colors. C. the two opposing limbs have different surface temperatures. D. the distance between Earth and the Sun is constantly changing.
To make a profit a buyer purchases metal by weight at one altitude and sells it at the same price per pound at another altitude. The supplier should
A) buy at a high altitude and sell at a low altitude. B) buy at a low altitude and sell at a high altitude. C) it makes no difference.
The magnetic field in a superconducting solenoid is 3.0 T. How much energy per unit volume is stored in the solenoid, in J/m3? ?0 = 4?× 10?7 T ? A/m
What will be an ideal response?