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Assuming the sun to have a spherical outer surface of radius r radiating like a black body at temperature t degree C. The power received by a unit surface (normal to the incident rays) at a distance R from the centre of the sun is where sigma is the Stefan’s constant.
31
Aug
Assuming the sun to have a spherical outer surface of radius r radiating like a black body at temperature t degree C. The power received by a unit surface (normal to the incident rays) at a distance R from the centre of the sun is where sigma is the Stefan’s constant. A piece of iron [...]
A black body is at 727 degree C. It emits energy at a rate which is proportional to
31
Aug
A black body is at 727 degree C. It emits energy at a rate which is proportional to A black body is at 727 degree C. It emits energy at a rate which is proportional to August 31, 2020 Category: Chapter 17 - Thermal Properties of Matter , NEET Last 32 Years Solved 1988 - [...]
A string with one end fixed on a rigid wall, passing over a fixed frictionless pulley at a distance of 2m from the wall, has a point mass M of 2kg attached to it at a distance of 1m from the wall. A mass m of 0.5kg is attached to the free end. The system is initially held at rest so that the stirng is horizontal between wall and pulley and vertical beyond the pulley as shown in figure.
31
Aug
A string with one end fixed on a rigid wall, passing over a fixed frictionless pulley at a distance of 2m from the wall, has a point mass M of 2kg attached to it at a distance of 1m from the wall. A mass m of 0.5kg is attached to the free end. The system [...]
The power radiated by a black body is P and it radiates maximum energy at wavelength, λ0. If the temperature of the black body is now changed so that it radiates maximum energy at wavelength 4/3λ0, the power radiated by it becomes nP. The value of n is?
31
Aug
The power radiated by a black body is P and it radiates maximum energy at wavelength, λ0. If the temperature of the black body is now changed so that it radiates maximum energy at wavelength 4/3λ0, the power radiated by it becomes nP. The value of n is? The power radiated by a black body [...]
A black body at 227°C radiates heat at the rate of 7 cals/cm² s^1. At a temperature of 727°C, the rate of heat radiated in the same units will be
31
Aug
A black body at 227°C radiates heat at the rate of 7 cals/cm² s^1. At a temperature of 727°C, the rate of heat radiated in the same units will be A black body at 227°C radiates heat at the rate of 7 cals/cm² s^1. At a temperature of 727°C the rate of heat radiated in [...]
Figure A smooth circular path of radius R on the horizontal plane which is quarter of a circle A block of mass m is taken from position A to B under the action of a constant force F. Calculate the work done by force F. a. If it is always directed horizontally b. If the block is pulled by a force F which is always tangential to the surface c. Block is pulled with a constant force F which is always directed towards the point B
31
Aug
Figure A smooth circular path of radius R on the horizontal plane which is quarter of a circle A block of mass m is taken from position A to B under the action of a constant force F. Calculate the work done by force F. a. If it is always directed horizontally b. If the [...]
If the radius of a star R and it acts as a black body, what would be the temperature of the star, in which the rate of energy production is Q? (σ for stefan’s constant.)
31
Aug
If the radius of a star R and it acts as a black body, what would be the temperature of the star, in which the rate of energy production is Q? (σ for stefan’s constant.) If the radius of a star R and it acts as a black body in which the rate of energy [...]
A piece of iron is heated in a flame. It first becomes dull red then becomes reddish yellow and finally turns to white hot. The correct explanation for the above observation is possible by using
31
Aug
A piece of iron is heated in a flame. It first becomes dull red then becomes reddish yellow and finally turns to white hot. The correct explanation for the above observation is possible by using A piece of iron is heated in a flame. It first becomes dull red then becomes reddish yellow and finally [...]
On observing light from three different stars P, Q and R, it was found that intensity of violet colour is maximum in the spectrum of P, the intensity of green colour is maximum in the spectrum of R and the intensity of red colour is maximum in the spectrum of Q. If TP,TQ and TR are the respective absolute temperature of P, Q and R, then it can be concluded from the above observations that
31
Aug
On observing light from three different stars P, Q and R, it was found that intensity of violet colour is maximum in the spectrum of P, the intensity of green colour is maximum in the spectrum of R and the intensity of red colour is maximum in the spectrum of Q. If TP,TQ and TR [...]
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it was found that intensity of violet colour is maximum in the spectrum of P ,
On observing light from three different stars P ,
Q and R ,
the intensity of green colour is maximum in the spectrum of R and the intensity of red colour is maximum in the spectrum of Q. If TP ,
then it can be concluded from the above observations that ,
TQ and TR are the respective absolute temperature of P ,
A water pump rated 400 W, has an efficiency of 75%. If it is employed to raise water through a height of 40 m, the volume of water drawn in 10 min is :
31
Aug
A water pump rated 400 W, has an efficiency of 75%. If it is employed to raise water through a height of 40 m, the volume of water drawn in 10 min is : A water pump rated 400 W has an efficiency of 75%. If it is employed to raise water through a height [...]