How does content of elements heavier than helium vary between young and old stars? Why?
What will be an ideal response?
Older stars are made of almost nothing but the hydrogen and helium made in the Big Bang, but younger stars are much richer (1-4%) in the heavier elements produced by later generations of supernovae.
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When the first law of thermodynamics, Q = ?u + W, is applied to an ideal gas that is taken through an adiabatic process,
A) ?u = 0. B) W = 0. C) Q = 0. D) it is not true that ?u = 0 or W = 0 or Q = 0.
Which of these singly ionized atoms of the same speed will curve most in a magnetic field?
A) helium B) iron C) uranium D) all the same
An electron in a hydrogen atom makes a transition from the n = 4 to the n = 3 energy state. Determine the energy (in eV) of the emitted photon
a. 0.54 b. 0.66 c. 0.85 d. 1.51 e. 10.2
Internal human body temperature is often stated to be normal at 98.6°F. What is this temperature on the Kelvin scale?
A) 346 K B) 393 K C) 310 K D) 296 K E) 418 K