In order to distinguish between wavelengths independent of light intensity, one must have at least pigment(

a. ? three

b. ? two

c. ? four

d. one?

An alarm clock has a current of 4.5 amps and a resistance of 3.2 ohms. what is the voltage in the circuit? a.1.4 volts b.0.71 volts c.14 volts d.46 volts

What type of force holds atoms together in a crystal?

You notice the birds sitting on the electrical wires which of the following explain why the birds don't get shocked