How is the Schwartzschild radius calculated?
What will be an ideal response?
The Schwartzschild radius is roughly 3 km times the mass of the star in solar masses.
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A heat pump uses 100 J of work to output 150 J of heat at some temperature. What is the coefficient of performance for the heat pump?
A. 1.0 B. 1.5 C. 2.0 D. 2.5 E. 3.0
Matter Waves: Protons are being accelerated in a particle accelerator. When the speed of the protons is doubled, their de Broglie wavelength will
A. increase by a factor of 4.
B. increase by a factor of 2.
C. decrease by a factor of 2.
D. increase by a factor of 
.
E. decrease by a factor of 
.
Which sugar is the sweetest of all sugars?
a. Sucrose b. Lactose c. Glucose d. Fructose
Two loudspeakers are placed facing each other and driven by the same source at 680 Hz. A listener is positioned between the two speakers on the line separating them, thus creating a constructive interference at the listener's ear. What minimum distance would one of the speakers be moved back away from the listener to produce destructive interference at the listener's ear? (The speed of sound =
340 m/s.) a. 0.13 m c. 0.50 m b. 0.25 m d. 1.00 m