Star A has twice the absolute temperature of star B, but they both have the same radius. What is the ratio of star A’s power output to star B’s output due to electromagnetic radiation? The emissivity of both stars can be assumed to be 1
1.4
2.8
3.16
4.64
3
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The magnetic field of a plane-polarized electromagnetic wave moving in the z-direction is given by 
in SI units. What is the speed of the EM wave?
A. 3 × 108 m/s B. 100 m/s C. 106 m/s D. 2 × 107 m/s E. 2 × 108 m/s
We are able to define a mechanical equivalent for heat because
A. some thermal energy can be converted into mechanical energy. B. mechanical energy can be converted into thermal energy. C. work can be converted into thermal energy. D. some thermal energy can be converted into work. E. all of the above can occur.
Which is largest?
A) a galaxy B) a local group C) a Supercluster D) the observable universe
What is an atom made of?
A.) Photons and electrons. B.) Photons, gravitons, and strange quarks. C.) Protons, neutrons, and electrons. D.) Positrons and electrons. E.) Neutrons, photons, and W bosons.