The radioactive isotope 7Be (atomic number 4 ) decays to the isotope 7Li (atomic number 3). What type of radioactive decay is this?
A) electron capture
B) beta decay
C) electron ionization
D) alpha decay
A
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A 0.25 kg ideal harmonic oscillator has a total mechanical energy of 4.0 J. If the oscillation amplitude is 20.0 cm, what is the oscillation frequency?
A) 4.5 Hz B) 1.4 Hz C) 2.3 Hz D) 3.2 Hz
A 4-kg object falls vertically a distance of 5 m. Its potential energy has changed by approximately how much?
a. It has increased by 20 J. b. It has decreased by 200 J. c. It has decreased by 20 J. d. It has increased by 200 J.
With which object would the wave nature of matter be significant?
a. A hard-thrown baseball b. A speeding truck c. A moving electron d. An orbiting planet
Stalactites are
a. Rocks solidified from molten material below ground. b. Consolidated sediment deposited in layers. c. Dripstone formations that form on cavern floors. d. Dripstone formations that form on cavern ceilings.