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Concepts Of Physics MCQ Edition [Volume 1]

Exam: Concepts Of Physics MCQ Edition [Volume 1]
Subject: Physics
Chapter: Introduction to Physics

Concepts Of Physics MCQ Edition [Volume 1] · Physics · Introduction to Physics

Determine the power of a 100 watt bulb in CGS units.

Determine the power of a

100 \text{ watt}

bulb in CGS units.

Options

A $10^7 \text{ erg/s}$
B $10^5 \text{ erg/s}$
C $10^{11} \text{ erg/s}$
D $10^9 \text{ erg/s}$

Correct answer

D. $10^9 \text{ erg/s}$

Step-by-step solution

Given power of the bulb is

P = 100 \text{ W}

.

The SI unit of power is watt (W), which is equal to joule per second (J/s).

Therefore,

P = 100 \text{ J/s}

.

In the CGS system, the unit of energy is erg, and

1 \text{ J} = 10^7 \text{ erg}

.

Converting the power into CGS units:

P = 100 \times 10^7 \text{ erg/s} = 10^9 \text{ erg/s}

.

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