The pressure of sunlight was one of the forces that cleared the solar nebula
Indicate whether the statement is true or false
T
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Group ______________A elements have two valence electrons
Fill in the blank(s) with correct word
Temperature measures
a. how much heat is in a substance. b. the internal energy of an object. c. the average speed of atoms and molecules in a substance. d. the average kinetic energy of atoms and molecules in a substance.
Which color of visible light carries the most energy per photon?
A) red B) green C) blue D) violet E) all the same
This photograph shows x-ray emission from a supernova remnant. What is the source of the x-rays?
A) hot gas expanding outward from the site of a supernova B) cold gas that will soon give birth to new stars C) accretion disk around a black hole near the center of the supernova remnant D) spots within the remnant where hot gas is crashing into and destroying planets