Question

If you can notice the difference in brightness between two flashlights when one is using a 10 watt bulb and the other a 15 watt bulb, which of the following bulb wattages would you best be able to discriminate from a 100-watt bulb.

A. 90 watts
B. 120 watts
C. 60 watts
D. 75 watts
E. 150 watts

Answer 1

Answer:

option (E) 150 watts

Explanation:

Data provided in the question:

Bulb used in the flashlights are 10 watt bulb and the 15 watt bulb.

Now,

To discriminate from a 100-watt bulb

The first step is to divide the watt of given bulb as:

⇒ 15 ÷ 10

= 1.5

Multiplying the above result with the 100 watt

we get

= 150 watts

Hence,

answer is option (E) 150 watts