What kind of energy source transforms heat energy from the earth into mechanical and electrical energy?
a. geothermal
c. solar
b. hydro-electric
d. turbine

Frequency of electromagnetic waves that a radio station is assigned. what do you call this type of wave?

Acertain half-reaction has a standard reduction potential e_red^0 = -0.94 v. an engineer proposes using this half-reaction at the cathode of a galvanic cell that e must provide at least 1.00 v of electrical power. the cell will operate under standard conditions. a. is there a minimum standard reduction potential that the half-reaction used at the anode of this cell can have? b. is there a maximum standard reduction potential that the half-reaction used at the anode of this cell can have?

Which wave would cause destructive interference at every point of the wavelength and completely cancel out the wave?