Physics

Problem

60\,\text{W}

electric bulb is kept on continuously. Assuming

0.10\,\text{mg}

of matter is annihilated and all the energy is used only to power this bulb, for approximately how long (in years) can the bulb glow? a)

2\,\text{years}

4.8\,\text{years}

0.5\,\text{year}

20\,\text{years}