Set the following units of energies in increasing order.
(A) Joule
(B) eV
(C ) K.W.H
(D) erg

Options

A. ABCD
B. BDAC
C. DCBA
D. CABD

Answer

To set the given units of energy in increasing order, we need to convert all the units into a common unit. We will use Joules (J) as the standard unit for this comparison.

### Step-by-Step Solution:

1. **Identify the Units**: The units we need to compare are:
- (A) Joule (J)
- (B) Electron Volt (eV)
- (C) Kilowatt Hour (kWh)
- (D) Erg

2. **Convert Each Unit to Joules**:
- **Joule**: 1 Joule = 1 J
- **Electron Volt (eV)**:
- 1 eV = \(1.6 \times 10^{-19}\) Joules
- **Kilowatt Hour (kWh)**:
- 1 kWh = \(3.6 \times 10^6\) Joules
- (Calculation: 1 kW = 1000 J/s and 1 hour = 3600 seconds, thus \(1000 \times 3600 = 3.6 \times 10^6\) J)
- **Erg**:
- 1 Erg = \(1 \times 10^{-7}\) Joules

3. **List the Values**:
- (A) Joule = 1 J
- (B) Electron Volt = \(1.6 \times 10^{-19}\) J
- (C) Kilowatt Hour = \(3.6 \times 10^6\) J
- (D) Erg = \(1 \times 10^{-7}\) J

4. **Compare the Values**:
- \(1.6 \times 10^{-19}\) J (eV) < \(1 \times 10^{-7}\) J (erg) < \(1\) J (Joule) < \(3.6 \times 10^6\) J (kWh)

5. **Order the Units**:
- The increasing order of energy units is:
- (B) eV < (D) erg < (A) Joule < (C) kWh

### Final Answer:
The increasing order of the units of energy is:
(B) eV < (D) erg < (A) Joule < (C) kWh

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