10. In a wet type of voltaic cell, what is electrolyte?
ة في
b.
a bridge made of salt
a copper strip
an acidic liquid
a spontaneous flow of electrons
d.
11. Piezoelectricity is caused by pressing or squeezing
a.
b.
C.
d.
power rods
crystals
zinc plates
magnets
12.
Four 9-volt batteries are connected in parallel. How much volta
across the circuit?

What are the applications of electromagnetic waves

An object with initial temperature 130 ∘ f is submerged in large tank of water whose temperature is 50 ∘ f . find a formula for f ( t ) , the temperature of the object after t minutes, if the cooling constant is k = − 0.2 . remember newton's law of cooling (the rate of change of temperature with respect to time is equal to k times the difference between the temperature of the object and the surrounding temperature) ! : )

What types of radiation make up the electromagnetic spectrum?