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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.
In this system, d = 6 in., D = 12 in., Δz 1 = 6 ft, and Δz 2 = 12 ft. The discharge of water in the system is 10 cfs. Is the machine a pump or a turbine? What are the pressures a
Energy is transmitted in a plane in two mutually perpendicular directions. Example : Wave propagating on the surface of water.
In an electric field rate of change of potential with distance is called as potential gradient. It is a vector quantity and its direction is differing to that of electric field. Po
Explain physically how a p-n junction functions as a rectifier. Ans: When a P-N junction diode is forward-biased and applied voltage is increased from zero, hardly any current
Define the Tea in Thermos? One liter of tea at 90° C is poured keen on a vacuum-insulated container (thermos). The surface area of the thermos walls A=600 cm 2 . The volume am
A 25nF capacitor is connected in parallel with a coil of resistance 2kΩ and inductance 0.20H across a 100V, 4 kHz supply. Determine (a) The current in the coil, (b) The cur
Determinism principle It is the principle that if one knows the state to an infinite accuracy of a system at one point in time, one would be capable to know about the state of
Explain the Transmission of Heat Transmission of heat (movement of heat from the hotter item to the colder item) can be brought about three ways: by conduction, convection, and
Specific heat of a gas is numerically equivalent to the amount of heat essential to raise the temperature of unit mass of gas by 1 0 C. In order to raise the temperature of unit ma
consider a star orbitining in the sperically graviational potential Y=(Vc)2 ln(r/r0). a)use conservation of energy and angular momentum to obtain equation for dr/dt and d(teta)/dt
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