An element has an atomic mass number of 14 and atomic number 6. (a) How many protons does it have? (b) How many neutrons does it have?
What will be an ideal response?
(a) 6
(b) 8
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Superconducting electromagnets
A) account for cases of magnetic levitation. B) are characterized by easy penetration of external magnetic fields. C) both of these D) none of the above
The direction of the force exerted on a moving charge in a magnetic field is
A) in the direction of the motion. B) opposite its motion. C) at right angles to the direction of the motion.
Violent impacts of infalling particles release energy called ____________
Fill in the blank(s) with correct word
An angle of 1 arcsecond is
A) about the width of your fist held at arm's length. B) about the width of a finger held at arm's length. C) less than the thickness of a human hair held at arm's length. D) slightly more than the width of a basketball held at arm's length.