Explain how the central engine powers an active nucleus or quasar
What will be an ideal response?
Matter from an accretion disk spirals inward toward the event horizon of the supermassive black hole. This matter accelerates close to the speed of light, and the high speed and temperature converts about 20% of the infalling matter into high energy radiation that ionizes the surrounding regions. The magnetic fields also focus the jets of outflowing hot gas perpendicular to the accretion disk.
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Pressure (P) waves can travel through a liquid, but shear (S) waves cannot
a. True b. False Indicate whether the statement is true or false
What is the wavelength of the longest wavelength light that can be seen with the human eye?
a. 400 nm b. 4000 nm c. 7000 nm d. 700 nm e. 3×10^8 m
Two ideal parallel-plate capacitors are identical in every respect except that one has twice the plate area of the other. If the smaller capacitor has capacitance C, the larger one has capacitance
A) C/2. B) 4C. C) 2C. D) C.
The initial mass of a protostar generally determines the star's future evolution. But in some cases, what can alter this process?
A) The star may be isolated in space, far from other influences. B) The star may gain mass by passing through a dark cloud. C) The star may be in a spectroscopic binary system. D) The star may drift away from the other stars in its formation cluster. E) The star may collide with another, unrelated star.