You Have a Lamp with a Three-Way Light Bulb

question 207

Multiple Choice

You have a lamp with a three-way light bulb. You can use the light at 50 watts, 100 watts, or 150 watts. When you change between settings, which of the following changes will be perceived as a larger increase in brightness?

• A)from 50 to 100 watts
• B)from 100 to 150 watts
• C)both changes will result in an equivalent difference
• D)it would depend on whether there is any additional light present in the room

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