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Concepts Of Physics MCQ Edition [Volume 1]PhysicsIntroduction to Physics

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

Options

  1. A10^7 erg/s
  2. B10^5 erg/s
  3. C10¹¹ erg/s
  4. D10^9 erg/s

Correct answer

D. 10^9 erg/s

Step-by-step solution

Given power of the bulb is P = 100 W . The SI unit of power is watt (W), which is equal to joule per second (J/s). Therefore, P = 100 J/s . In the CGS system, the unit of energy is erg, and 1 J = 10^7 erg . Converting the power into CGS units: P = 100 10^7 erg/s = 10^9 erg/s .

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