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The value of Stefan's constant is sigma ...

The value of Stefan's constant is `sigma =5.76xx 10^(-8) J s^(-1) m^(-2)K^(-4).` Find its value in cgs system.

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The correct Answer is:
`5.67xx10^(-5) ergs^(-1)cm^(-2)K^(-4)`
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Stefan’s contain (s) derives from other known con- stant of nature, viz. Boltzmann constant, (k) planck’s con- stant (h) and speed of light in vacuum (c). Value of the constant is sigma=5.67xx10^(-8)Js^(-1)m^(-2)K^(-4) If speed of light were 2% more than its present value, how much different (in percentage) the value of sigma would have been?

If the value of universal gravitational constant is 6.67xx10^(11) Nm^2 kg^(-2), then find its value in CGS system.

G = 6.67 xx 10^(-11) kg^(-1) m^(3) s^(-2) . Convert it into CGS system.

The value of universal gravitational constant is 6.67xx10^(-8) "dyne" g^(-2) cm^2. What is its value in Mks system?

An electric bulb with a tungsten filament has an area of 0.20 cm^2 and is raised to a temperature of the bulb to 3000 K emissivity of the filament is 0.40 and Stefan's constant is 5.7 xx 10^(-5) erg s^(-1) cm^(-1) K^(-4) . The electrical energy consumed by the bulb is E_1 watt. If due to fall in voltage, the temperature of the filament falls to 2800 K, then the wattage of the bulb is E_2 watt. Calculate the value of E_1 - E_2 , close to nearest integer.

A thin square steel plate with each side equal to 10 cm is heated by a blacksmith. The rate of radiated energy by the heated plate is 1134 W . The temperature of the hot steel plate is (Stefan's constant sigma = 5.67 xx10^(-8) " watt "m^(-2) K^(-4) , emissivity of the plate = 1)

A metallic sphere having radius 0.08 m and mass m = 10 kg is heated to a temperature of 227^(@)C and suspended inside a box whose walls ae at a temperature of 27^(@)C . The maximum rate at which its temperature will fall is:- (Take e =1 , Stefan's constant sigma = 5.8 xx 10^(-8) W//m^(-2)K^(-4) and specific heat of the metal s = 90 cal//kg//deg J = 4.2 "Joules"//"Calorie")

The value fo universal gravitationla constant G in CGS system is 6.67xx10^(-8) dyne cm^(2) g^(-2) . Its value in SI system is

SL ARORA-PHYSICAL WORLD AND MEASUREMENTS-problem for self practice
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