A body of area `0.8xx10^-2m^2` and mass `5xx10^(-4)kg` directly faces the sun on a clear day. The body has an emissivity of 0.8 and specific heat of `0.8 cal//kg` K. The surroundings are at `27^@C`. (solar constant `=1.4 kW//m^(2)`). Q. The rate of rise of the body's temperature is nearly

A body of area 0.8xx10^(-2) m^(2) and mass 5xx10^(-4) kg directly faces the sun on a clear day. The body has an emissivity of 0.8 and specific heat of 0.8 ca//kg K. The surroundings are at 27^@C . (solar constant =1.4 kW//m^(2) ). The maximum attainable temperature of the body is

A body of area 0.8xx10^(-2) m^(2) and mass 5xx10^(-4) kg directly faces the sun on a clear day. The body has an emissivity of 0.8 and specific heat of 0.8 ca//kg K. The surroundings are at 27^@C . (solar constant =1.4 kW//m^(2) ). The maximum attainable temperature of the body is

A body of area 0.8xx10^-2m^2 and mass 5xx10^-4kg directly faces the sun on a clear day. The body has an emissivity of 0.8 and specific heat of 0.8 cal//kg K. The surroundings are at 27^@C . (solar constant =1.4 kW//m^(2) ). The temperature that the body would reach if it lost all its heat by radiation is

A body of area 0.8xx10^-2m^2 and mass 5xx10^-4kg directly faces the sun on a clear day. The body has an emissivity of 0.8 and specific heat of 0.8 cal//kg K. The surroundings are at 27^@C . (solar constant =1.4 kW//m^(2) ). The temperature that the body would reach if it lost all its heat by radiation is

Thermal capacity of a body of mass 10 g is "8 cal ".^(@)C^(-1) . The specific heat of the material of the body is

A body has -0.8 xx 10^(-18) C charge. What is the number of excess electrons in the body?

A hot body at 800^@C is radiating 500 J of energy per minute. Calculate the surface area of the body if emissivity is 0.23 and Stefan's constant is 5.67 xx 10^(-8) Wm^(-2) K^(.-4) .

The density of steam at 27^@C and 8.314xx10^4 pascal is 0.8 kg m^(-3) .The compressibility factor would be

The density of steam at 27^@C and 8.314xx10^4 pascal is 0.8 kg m^(-3) .The compressibility factor would be

A wire of length 1 m and radius 10^-3 m is carrying a heavy current and is assumed to radiate as a black body. At equilibrium, its temperature is 900 K while that of surrounding is 300 K. The resistivity of the material of the wire at 300 K is pi^@xx10^-8 ohm m and its temperature coefficient of resistance is 7.8xx10^(-3)//C (stefan's constant sigma=5.68xx10^-8W//m^(2) K^(4) ). Q. The resistivity of wire at 900 K is nearly