All particles can be classified into
a. Leptons and quarks
b. Hadrons and leptons
c. Baryons and leptons
d. Mesons and Baryons
b
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When a ?+ particle is emitted from an unstable nucleus, the atomic number of the nucleus
A) increases by 1. B) does not change. C) decreases by 1. D) increases by 2. E) decreases by 2.
Which isotopes are radioactive?
A) none B) some C) all D) even numbered E) odd numbered
Geologists think that Earth is how old?
a. 4560 billion years b. 45.6 thousand years c. 45.6 million years d. 4.56 billion years
A charge, +Q, is placed inside a balloon and the balloon is inflated. As the radius of the balloon r increases the number of field lines going through the surface of the balloon:
a. increases proportional to r2. c. stays the same. b. increases proportional to r. d. decreases as 1/r.