The atomic mass number of a nucleus is equivalent to which of the following numbers?
a. number of neutrons present
b. number of protons present
c. difference in neutron and proton numbers
d. sum of neutron and proton numbers
d
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Which of the following best describes the fundamental difference between two different chemical elements (such as oxygen and carbon)?
A) They have different numbers of protons in their nucleus. B) They have different atomic mass numbers. C) They have different numbers of electrons. D) They have different names.
The heat of fusion of ice is 80. kcal/kg-C°. When 50. g of ice at 0°C is added to 50. g of water at 25°C, what is the final temperature?
What will be an ideal response?
Four point charges are on the rim of a circle. The charges are (in mC) +0.50, +3.0, -1.0, -0.50 . If the electrical potential at the circle's center due to the +0.5 charge alone is 4.5 × 10^4 V, what is the total potential at the center due to the four charges combined?
a. 18 × 10^4 V c. zero b. 4.5 × 10^4 V d. -4.5 × 10^4 V
How do astronomers know that the luminous regions of active nuclei of active galaxies are very small?
a. Their nuclei are much brighter than expected. b. The orbits of stars near the center of the galactic nuclei are faster than expected. c. The luminosity of the nuclei varies over short times. d. The color of the nuclei is different than expected.