Of the thousands of different isotopes known to exist,
a. most of them are radioactive
b. only a couple can be used to build an atom bomb
c. some are used in medical diagnosis and treatment
d. most occur naturally
e. all of the above
A, B, C
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In the context of the Sun, which of the following statements is true of electromagnetic radiation?
A) Protons cannot make electromagnetic radiation. B) Electromagnetic radiation is usually made by electrons. C) Electromagnetic radiation is made when most of the electrons in the Sun are static. D) The presence of isotopes in the Sun causes the emission of electromagnetic radiation.
An object in mechanical equilibrium is an object
A) moving with constant velocity. B) having no changes in velocity. C) at rest. D) all of the above
Light from an object near the event horizon received by a distant observer is ________
Fill in the blank(s) with correct word
Which of the following planets cannot be seen with the naked eye?
A) Venus B) Mars C) Jupiter D) Saturn E) Neptune