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this thermal raidiation is visible light and for an object that is about 2500° Celsius, about 10% is visible light. The light that you see from the bulb is the visible portion of its thermal radiation. However, most of the filament's thermal radiation is invisible infrared light. While you can feel this infrared light warming your hand, you can't see it. Because only about 80% of the electric power delivered to the bulb becomes thermal radiation and only about 12% of that thermal radiation is visible, an incandescent light bulb is only about 10% energy efficient. Other types of lamps, including flourescent and gas discharge lamps, are much more energy efficient."
૪. મુનિ યશોવિજયજી, પૂર્વ ઉદ્ધૃત ગ્રન્થ, પૃષ્ઠ ૧૯, ૨૦
૫. પ્રથમ ભાગની ટિપ્પણી ૪૪ (a),(b),(c) દર્શાવી છે.
૬. મુનિ યશોવિજયજી, પૂર્વ ઉદ્ધૃત ગ્રન્થ, પૃષ્ઠ ૧૦૨
7. (a) Satish K. Gupta, op. cit., p. 736
"Hertz's experimental arrangement consists of two metal plates P and P, held parallel to each other and connected to two metal spheres, S, and S, through thick metallic rods R, and R. The distance between the metal plates was about 60 cm and the separation between the two spheres was about 2-3 cm. The spheres can be slided over the rods, so as to adjust the gap between them. An induction coil is used to apply a high voltage of several thousand volt across the two metal plates. When the discharge of metal plates takes place in the form of a spark in the gap between spheres S, and S,, eelctromagnetic waves are radiated. The waves so radiated can be detected with the help of a detector made of a circular coil and two metal spheres S,' and S
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INDUCTION COIL
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P1
P2
R1
QS,
R2
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DETECTOR
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