What happens after the helium flash?
A) The core suddenly contracts.
B) The star breaks apart in a violent explosion.
C) The core stops fusing helium.
D) The core quickly heats up and expands.
E) The star starts to fuse helium in a shell outside the core.
D
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Find the frequencies of the first three harmonics of a 1.0-m long string which has a mass per unit length of 2.0 × 10^?3 kg/m and a tension of 80 N when both ends are fixed in place
A container of ideal gas at STP undergoes an isothermal expansion and its entropy changes by 3.7 J/K. How much work does it do?
A. zero
B. 
C. 
D. none of the above.
A metal surface is illuminated with blue light and electrons are ejected at a given rate each with a certain amount of energy. If the intensity of the blue light is increased, electrons are ejected
A) at the same rate, but with more energy per electron. B) at the same rate, but with less energy per electron. C) at an increased rate with no change in energy per electron. D) at a reduced rate with no change in energy per electron.
The temperature of the layer of gas that produces the visible light of the Sun is
A) 3,500 K B) 5,800 K C) 12,300 K D) 300,000 K E) 15 million K