Mass number refers to the number of
A) protons in the nucleus.
B) neutrons in the nucleus.
C) nucleons in the nucleus.
Answer: C
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Astronomical objects are viewed against the background of the ________
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A weight lifter can bench press 171 kg. How many milligrams (mg) is this?
A) 1.71 × 108 mg B) 1.71 × 109 mg C) 1.71 × 107 mg D) 1.71 × 106 mg
An electron and a positron annihilate each other, emitting two identical photons in the process. What is the wavelength of these photons? The mass of an electron or positron is 9.11 × 10-31 kg and h = 6.63 × 10-34 Js
A) 1.21 × 10-12 m B) 1.73 × 10-12 m C) 2.43 × 10-12 m D) 3.07 × 10-12 m E) 3.46 × 10-12 m
This figure is a diagram of a multiflash image of an air puck moving to the right on a horizontal surface. The images sketched are separated by equal time intervals, and the first and last images show the puck at rest. In figure d, which color graph best shows the puck’s acceleration as a function of time?