What is the symbol for a photon?
a. n b.
c. d. none of the above
c
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One mole of helium gas expands adiabatically from 2 atm pressure to 1 atm pressure. If the original temperature of the gas is 20°C, what is the final temperature of the gas? (? = 1.67)
Human reaction time is usually greater than 0.10 s. If your friend holds a ruler between your fingers and releases it without warning, how far can you expect the ruler to fall before you catch it?
A. at least 3.0 cm B. at least 4.9 cm C. at least 6.8 cm D. at least 9.8 cm
What is the magnitude of the current in the 20-? resistor?
a.
0.75 A
b.
0.00 A
c.
0.25 A
d.
0.50 A
e.
1.00 A
How did astronomers discover the relationship between spectral type and mass for main sequence stars?
a. by measuring stellar radii with very powerful optical telescopes b. by measuring stellar radii with very powerful radio telescopes c. by comparing stars with the same spectral type but different luminosities d. by using computer models of hydrogen fusion and stellar structure e. by measuring the masses and spectral types of main-sequence stars in binary systems