At peak brightness, the white dwarf supernova is approximately ________ times as luminous as the massive star supernova at peak brightness.
A) 1.5
B) 3
C) 10
D) 100
B) 3
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If the efficiency of a Carnot engine were to be 100%, the heat sink would have to be
A) infinitely hot. B) at 0°C. C) at absolute zero. D) at 100°C.
Werner Heisenberg
A) developed a wave equation for matter waves (1926). B) was the first to produce X-ray-like diffraction patterns of electrons passing through thin metal foil (1927). C) set the limits on the probability of measurement accuracy (1927). D) suggested the existence of matter waves (1924). E) predicted the positron from relativistic quantum mechanics (1928).
If a planet has 3 times the radius of the Earth, but has the same density as the Earth, what is the gravitational acceleration at the surface of the planet? (g = 9.80 m/s2)
a. 29.4 m/s2 b. 88.2 m/s2 c. 265 m/s2 d. 3.27 m/s2
An electron (m = 9.1 × 10^?31 kg, q = ?1.6 × 10^?19 C) starts from rest at point A and has a speed of 5.0 × 10^6 m/s at point B. Only electric forces act on it during this motion. Determine the electric potential difference VA ? VB
a. ?71 V b. +71 V c. ?26 V d. +26 V e. ?140 V