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Stefan-Boltzmann law (Stefan, L. Boltzmann):
The radiated power P (it is rate of emission of electromagnetic energy) of hot body is proportional to the radiating surface area, A, & the fourth power of the thermodynamic temperature, T. The constant of proportionality refer to the Stefan-Boltzmann constant. Mathematically specking,
P = e sigma A T4,
Where the efficiency rating e refer to the emissivity of the object.
A glass sphere of radius 15 cm has a small air bubble at a distance of 6 cm from its centre. When viewed normally along its diameter from the nearest side, the bubble seems to be 7
The coordinates of two points in space are A(1, 2, 3) and B(4, -1, 2). Determine the angle between radius vector A and B.
what is light
Q. In the given circuit, calculate the current through the circuit and mention its direction. Let the current be I. 7 I + 3 I + 5I + 5 I = 10 + 8 - 2 (i.e) 20 I = 1
workind and defination and symbol of zener diode
A ray of light in air is occurrence upon a flat piece of glass. How acts the path that the light travels along when it is in the glass compare with the path in the air?
At what angle should a body be projected with a given velocity 24m/s just to pass over the obstacle 14m high at a given distance of 24m. Solution: 14=24xtan(θ)-(g*)(24 2
Production of electricity by pressure: Certain crystals and semiconductors produce an emf between two opposite faces when the mechanical pressure on them is either increased or
Q. Why does a glass filled with water smash when you run your finger along the rim of the glass? Answer:- A portion of crystal stemware has a natural or resonant frequency
Describe coefficient of self induction, coefficient of mutual induction. What types of transformer is used in a bed lamp.
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