A star will experience a helium flash if
a. it is less massive than about 3 solar masses
b. its has become a red giant star
c. its has formed a helium core
d. the material in the core has gradually become degenerate
e. All of the above must be true.
E
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An engine takes in 150 J energy from a 400 K thermal source. If the engine discharges energy into a thermal reservoir at 150K, then what is the maximum amount of work one can get out of the engine?
A. 93.8 J B. 84.2 J C. 28.5 J D. 168 J
The hotter an object, the more blue it appears
Indicate whether the statement is true or false
Degenerate matter has two peculiar properties that can affect a star. One is that the degenerate gas resists compression, and the other is that the degenerate gas ____
a. is not density dependent b. does depend on temperature c. does not depend on temperature d. is not pressure dependent. e. does depend on the type of nuclei present
Light with wavelength 5.6 × 10^–7 is used to determine the position of an electron to within the wavelength of the light. What is the resulting uncertainty in the electron's velocity? h = 6.63 × 10^–34 J?s, me = 9.11 × 10^–31 kg
a. 1300 m/s b. 103 m/s c. 207 m/s d. 16,331 m/s