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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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.
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