Relate escape speed to event horizon for a black hole
What will be an ideal response?
The escape speed allows an object moving fast enough to overcome the gravity of a body and escape into space. But for very massive black holes, if you are so close as to be within the event horizon, now this speed is greater even than c, the speed of light, so neither matter nor even energy can escape the gravity of the black hole.
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Which kind of telescope and which instrument or technique are shown?
a. optical, CCD
b. infrared, array detector
c. optical, adaptive optics
d. radio, interferometry
In beta minus decay, the number of neutrons in the nucleus is
A) decreased by 1. B) decreased by 2. C) increased by 1. D) increased by 2. E) remains unchanged.
Inductive reactance XL is given by
a. L? b. L/? c. 1/L? d. ?/L e. ?2L
Why aren't small asteroids spherical in shape?
A) Small asteroids have odd shapes because they were all chipped off larger objects. B) Large asteroids became spherical because many small collisions chipped off pieces until only a sphere was left; this did not occur with small asteroids. C) The strength of gravity on small asteroids is less than the strength of the rock. D) Large asteroids were once molten and therefore became spherical, but small asteroids were never molten.