In half wave rectifier a p-n diode with internal resistance `20Omega` is used. If the load resistance of `2kOmega` is used in the circuit, then find the efficiency of this half wave rectifier.

Explanation

To find the efficiency of a half-wave rectifier using a p-n diode with an internal resistance of 20 ohms and a load resistance of 2 kΩ, we can follow these steps:

### Step 1: Identify the given values
- Internal resistance of the diode, \( r = 20 \, \Omega \)
- Load resistance, \( R_L = 2 \, k\Omega = 2000 \, \Omega \)

### Step 2: Write the formula for efficiency
The efficiency (\( \eta \)) of a half-wave rectifier can be calculated using the formula:
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