Which of the following items is a good conductor of electricity?
a. glass
b. metal
c. plastic
d. rubber
e. wood

Why is alternating current more effective at long–distance travel than direct current? a. the power lines are made out of conductors. b. transformers increase or decrease voltage as needed. c. the ac generator is more efficient. d. ac has lower voltage than dc.

What is the conversion factor between kg/m^3 and g/m^3. express your experimental values for the densities in kg/m^3.

What type of light does this light bulb produce most (i.e. at what wavelength does the spectrum have maximum intensity)?