In the context of various observations made, which of the following statements is true of gamma-ray bursts?
A) They occur from one particular region in the sky.
B) They glow brightly and resemble novae.
C) Relatively long gamma-ray bursts are produced by a kind of supernova explosion.
D) Beams of intense radiation flowing into a star result in powerful gamma-ray bursts.
C
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Electroweak theory results in models for combining the electromagnetic, weak and strong nuclear interactions into a single basic force
Indicate whether the statement is true or false
The energy used by a 100 watt light bulb in 1 hour is 100 kilowatt-hours
Indicate whether the statement is true or false
A hydrogen atom is excited to the n = 10 stated. It then decays to the n = 4 state by emitting a photon which is detected in a photographic plate. What is the frequency of the detected photon? The lowest level energy state of hydrogen is -13.6 eV
(h = 6.626 × 10-34 J ? s, 1 eV = 1.60 × 10-19 J) A) 4.05 × 1014 Hz B) 1.73 × 1014 Hz C) 1.27 × 1014 Hz D) 0.865 × 1014 Hz E) 3.46 × 1014 Hz
Why is the Coriolis effect so weak on Venus?
A) because Venus rotates so slowly B) because Venus is so hot C) because Venus has such a thick atmosphere D) because Venus has such a strong greenhouse effect