How many electrons pass a given point in the
circuit in 12 min? The fundamental charge is
1.602 × 10−19 C.
To find the number of electrons passing through a given point in a circuit, we first need to know the current flowing through the circuit. The formula to calculate the electric current is:
I = Q/t
Where:
I is the electric current in amperes (A)
Q is the charge in coulombs (C)
t is the time in seconds (s)
In this case, we are given the time (12 minutes) but need to convert it to seconds since the SI unit for time is seconds.
12 minutes = 12 * 60 = 720 seconds
Now, we have the time (t = 720 s) and the charge (Q) is what we need to determine.
The fundamental charge is given as 1.602 × 10^(-19) C, which represents the charge of a single electron.
Since each electron has a charge of 1.602 × 10^(-19) C, the total charge passing through a point in the circuit can be calculated by multiplying the number of electrons by the charge of a single electron.
Now, we need to find the number of electrons. We can use the formula:
Q = n * e
Where:
Q is the total charge (in coulombs)
n is the number of electrons
e is the charge of a single electron (1.602 × 10^(-19) C)
Rearranging the formula, we find:
n = Q / e
Substituting the given values:
n = (Q / e) = (Q / 1.602 × 10^(-19) C)
To find Q, we can use the formula:
Q = I * t
Substituting the given values:
Q = I * t = (unknown) * 720 s
Since we don't know the current (I) from the given information, we cannot determine the exact number of electrons passing through a point in the circuit. The current value is necessary to complete the calculation.
If you have additional information, such as the resistance in the circuit, Ohm's Law (V = I * R) could be employed to find the current, thus allowing the calculation of the number of electrons passing through the point in the circuit.
6.50E13 photons eject 6.5E13 electrons in one second.
6.5E13 electrons (1.602E-19 C / 1 electron) = 1.04E-5 C / 1s = 1.04E-5 A (1E6 uA / 1 A) = 10.4 uA