Number of electrons transferred: 
Explanation:
The charge on the first object is

while the charge on the 2nd object is

When they are in contact, the final charge on each object will be

So, the amount of charge (electrons) transferred from the 1st object to the 2nd object is

The charge of one electron is

Therefore, the number of electrons transferred is

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The RC time constant, also called tau, the time constant (in seconds) of an RC circuit, is equal to the product of the circuit resistance (in ohms) and the circuit capacitance (in farads), i.e.

Here,
R = Resistance
C = Capacitance
Replacing we have that



Therefore the time constant of this circuit is 
The correct answer would be A) the lenses of the eye change the size of images
Answer:
A wedge is a machine that consists of two inclined planes, giving it a thin end and thick end. A wedge is used to cut or split apart objects. Force is applied to the thick end of the wedge, and the wedge applies force to the object along both of its sloping sides. This force causes the object to split apart