Chapter 12, Problem 48R

To determine

To Explain:The color appear by a shirt if the reflected form the shirt passed through a red filter and then through a green filter.

Answer to Problem 48R

One disadvantage it is warm source of light and hence requires air conditioning to cool the roomand it has higher operating cost.

Explanation of Solution

Introduction:

An incandescent light bulb, incandescent lamp or globe of incandescent light is an electric light with a wire filament that is heated until it glows. The filament is locked into a bulb to protect the filament against oxidation. Current is supplied by terminals or wires in the glass embedded in the filament.

Disadvantages of incandescent bulb are it is energy inefficient, it has very short lamp life time i.e. about $1000$ hours typically, it is warm source of light and hence requires air conditioning to cool the roomand it has higher operating cost, It is very fragile and hence needs to be handled very carefully, It generates low lumen per watt. Ordinary incandescent bulbs produces about $5$ to $20$ lumens per watt. This means it has lower efficacy.

Conclusion:

Hence, one disadvantage it is warm source of light and hence requires air conditioning to cool the roomand it has higher operating cost.