When an object floats in a liquid, the buoyant force is larger than the weight of the object
Indicate whether the statement is true or false
F
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Which statement concerning black hole masses and Schwarzschild radii is not true?
A) In a binary system with a black hole, the Schwarzschild radius depends on the distance from the black hole to the companion star. B) For black holes produced in massive star supernovae, Schwarzschild radii are typically a few to a few tens of kilometers. C) The more massive the black hole, the larger the Schwarzschild radius. D) Even an object as small as you could become a black hole if there were some way to compress you to a size smaller than your Schwarzschild radius.
The energy transformation that occurs during downhill skiing is
A) kin E ? grav E. B) chem E ? kin E + therm E. C) kin E ? grav E + therm E. D) grav E ? chem E. E) grav E ? kin E + therm E.
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) 3.46 × 1014 Hz B) 0.865 × 1014 Hz C) 1.27 × 1014 Hz D) 4.05 × 1014 Hz E) 1.73 × 1014 Hz
Standing waves are produced by the superposition of two waves with
A. the same amplitude, frequency, and direction of propagation. B. the same amplitude, frequency, and opposite direction of propagation. C. the same amplitude, different frequencies, and opposite direction of propagation. D. the same amplitude, different frequencies, and same direction of propagation.