Which units are appropriate for measurement of apparent brightness?

A) watts per square meter
B) watts
C) joules
D) newtons


A) watts per square meter

Physics & Space Science

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Bluer stars are brighter than redder stars of the same size. Assume both are typical stars

a. True b. False Indicate whether the statement is true or false

Physics & Space Science

Let k be the Boltzmann constant. If the configuration of molecules in a gas changes from one with a multiplicity of M1 to one with a multiplicity of M2, then entropy changes by:

A. ?S = 0 B. ?S = k(M2 ? M1) C. ?S = kM2/M1 D. ?S = k ln(M2M1) E. ?S = k ln(M2/M1)

Physics & Space Science

During an adiabatic process, an ideal gas does 25 J of work. What is the change in the internal (thermal) energy of the gas during this process?

A) -25 J B) 25 J C) 0.00 J D) 50 J E) -50 J

Physics & Space Science

Celestial longitude is called

a. declination. b. the parsec value. c. the zenith angle. d. right ascension.

Physics & Space Science