Number of Electrons Striking the Screen per Second

To calculate the number of electrons striking the screen per second, we need to use the given beam current of 80 microamperes (µA).

1. Convert beam current to amperes:
- 80 µA = 80 × 10^(-6) A = 0.00008 A

2. Find the charge carried by one electron:
- The charge of an electron is approximately 1.6 × 10^(-19) Coulombs (C).

3. Calculate the number of electrons passing through the tube per second:
- The formula to calculate the number of electrons passing through a conductor per second is:
Number of electrons = (Current in Amperes) / (Charge of one electron)
- Number of electrons = 0.00008 A / (1.6 × 10^(-19) C)

- Simplifying the above expression, we get:
Number of electrons = 5 × 10^14 electrons

Therefore, approximately 5 × 10^14 electrons strike the screen of the television tube per second.

Total Charge Stacking the Screen in 2 Minutes

To calculate the total charge stacking the screen in 2 minutes, we need to find the total number of electrons striking the screen and multiply it by the charge of one electron.

1. Calculate the total number of electrons striking the screen in 2 minutes:
- Number of electrons per second = 5 × 10^14 electrons (as calculated above)
- Number of electrons per minute = 5 × 10^14 electrons × 60 seconds = 3 × 10^16 electrons

- Number of electrons striking the screen in 2 minutes = 3 × 10^16 electrons × 2 minutes = 6 × 10^16 electrons

2. Calculate the total charge stacking the screen:
- The total charge is given by:
Total Charge = (Number of electrons) × (Charge of one electron)
- Total Charge = 6 × 10^16 electrons × 1.6 × 10^(-19) C

- Simplifying the above expression, we get:
Total Charge = 9.6 × 10^(-3) C

Therefore, the total charge stacking the screen of the television tube in 2 minutes is approximately 9.6 milliCoulombs (mC).