Since atoms are mostly empty space, why don't objects pass through one another?
A) The electrons on the atoms repel other electrons on other atoms when they get close.
B) The nucleus of one atom repels the nucleus of another atom when it gets close.
C) The nucleus of one atom attracts the nucleus of a neighboring atom to form a barrier.
D) The electrons of one attract the nucleus of a neighboring atom to form a barrier.
Answer: A
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On a cold winter's morning you awake and step out of bed. One foot is on the tile floor and the other is on a rug on the floor. Which statement is true?
A. The tile feels colder because it is connected to the cold ground outside B. The tile feels colder because it conducts heat more rapidly away from your foot C. The tile feels colder because it cannot absorb water like the rug can D. The tile feels colder because it is smoother than the rug
The ________ epoch explains the isotropy of the cosmic microwave background mapped by COBE
A) hydrogen dominated B) matter dominated C) inflationary D) radiation dominated E) dark energy dominated
An electron is accelerated through 100 kV. By what factor has its mass increased with respect to its rest mass?
A) 4.25 B) 1.20 C) 8.00 D) 1.55 E)
Hydrogen Balmer lines are essentially absent in the O and M type stars.
Answer the following statement true (T) or false (F)