Turn an incandescent lamp on and off quickly while you are standing near it. You feel its heat, but you find when you touch the bulb that it is not hot. Explain why you felt heat from the lamp.
To explain: The reason due to which the heat from an incandescent lamp is felt when turned on and off quickly but when touched, the bulb is not hot.
Explanation of Solution
Introduction:
The transmission of heat energy in the form of electromagnetic waves is called radiation.
The bulb transfers heat through the process of radiation when turned on. Hence, heat is felt. But, the lamp is turned off quickly. So, it does not get enough time to absorb heat. Hence, when touched, it appears cool.
Conclusion:
The incandescent lamp transfers heat energy through radiation but does not become hot itself as it is turned off quickly.
Chapter 22 Solutions
Conceptual Physics: The High School Physics Program
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