Analyzing Descriptions in A Black Hole Is NOT a Hole
Quiz
Active
7
9
10
TIME REMAINING
52:06
Why does the author include this description?
Read this excerpt from A Black Hole Is NOT a Hole.
One of the best black-hole clues is X-ray Shergy. As
matter approaches an event horizon, its atoms "shine"
with invisible X-rays. Although our eyes can't see the X-
rays, we can make detectors that respond to their
tremendous energy.
X-ray-catching telescopes make pictures of otherwise
invisible X-rays. The pictures reveal that certain areas in
outer space are emitting intense X-rays. Each bright
location points out where something extraordinary is
going on. It is a hint that a black hole might be there.
to explain why humans cannot see X-rays
to explain how X-rays help scientists study space
to explain that black holes are extraordinary
O to explain where black holes are located
Mark this and retum
Save and Exit
In water, a strong acid will break down into its component parts. a. completely b. partly c. never in water, a weak base will break down into its component parts. a. completely b. partly c. never
Energy defines the different "states" of matter. in no more than 3 sentences, describe the amount of kinetic energy that each of the 3 states of matter possesses and relate that to the atom/molecular motion of each "state".
Which statement about hf is true? it is zero for any compound in its standard state. it is positive when the bonds of the product store more energy than those of the reactants. it is negative when a compound forms from elements in their standard states. it is zero for any element that is in the liquid state.