Atoms that have the same number of protons but a different number of neutrons are called
a. ions.
b. molecules
c. atomic pairs.
d. nuclear pairs.
e. isotopes.
E
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The Tully-Fisher relation exists between the galaxy's luminosity and its
A) age. B) mass. C) size. D) rotation. E) color.
A blackbody's emission as observed through a low-density gas will produce a ____________________ spectrum
Fill in the blank(s) with correct word
As a proton moves in the direction the electric field lines
A) it is moving from low potential to high potential and gaining electric potential energy. B) it is moving from low potential to high potential and losing electric potential energy. C) it is moving from high potential to low potential and gaining electric potential energy. D) it is moving from high potential to low potential and losing electric potential energy. E) both its electric potential and electric potential energy remain constant.
A current element (length = 1.0 cm) lies along the x axis with its center at x = 0 and carries a 20-A current in the positive x direction. Consider only the field of this current element and decide which combination of the following statements is correct. 1. The field at (0, 0, 1.0 m) is in the positive z direction. 2. The field at (0, 1.0 m, 0) is in the negative y direction. 3. The field at
(1.0 m, 0, 0) is zero. 4. The field at (0, 0, 1.0 m) is in the negative y direction. a. 3 and 4 b. 1 and 3 c. 2 and 4 d. 1 and 2 e. None of these