An electron moving perpendicular to a uniform magnetic field of 3.2 × 10-2 T moves in a circle of radius 0.40 cm. How fast is this electron moving? (e = 1.60 × 10-19 C, melectron = 9.11 × 10-31kg)
A) 2.2 × 107 m/s
B) 1.9 × 107 m/s
C) 1.9 × 106 m/s
D) 3.0 × 107 m/s
E) 0.80 × 107 m/s
A
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The isotope 64Zn has a nuclear radius of 4.8 × 10^?15 m. Which of the following is the mass number of an isotope for which the nuclear radius is 3.6 × 10^?15 m?
a. 3 b. 1 c. 9 d. 27 e. 48
Two lightbulbs both operate on 120 V. One has a power of 25 W and the other 100 W. Which lightbulb has higher resistance?
1.The dim 25-W lightbulb does. 2.The bright 100-W lightbulb does. 3.Both are the same.
An alpha particle is another name for a(n)
a. electron b. proton c. neutron d. helium nucleus e. photon
Reasoning from the fact that the nucleus is very small, we can conclude that the nuclear force must
A) operate only between neutrons, and not between protons. B) have a very long range. C) have a very short range. D) be repulsive and very strong. E) be attractive and very strong.