Final answer:
The efficiency of a 100.0 W incandescent light bulb emitting 1.6 J of energy as visible light each second is 1.6%.
Step-by-step explanation:
To calculate the efficiency of an incandescent light bulb, we will compare its energy output in a usable form (visible light) with the energy it consumes.
Efficiency is calculated using the formula:
Efficiency (%) = (Useful Energy Output / Total Energy Input) × 100
Here, the total energy input per second for a 100.0 W bulb is 100.0 joules (since power is the rate of energy used per second and 1 watt = 1 joule per second). The useful energy output as visible light is given as 1.6 joules per second.
So, the efficiency can be calculated as follows:
Efficiency = (1.6 J/s / 100.0 J/s) × 100 = 1.6%
Therefore, the efficiency of the light bulb in converting electrical power to visible light is 1.6%.