Physics
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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Chapter 17 - Thermal Properties of Matter
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NEET Last 32 Years Solved 1988 - 2019 Physics and Chemistry Video Solutions
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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 black body is at a temperature of 5760 K. The energy of radiation emitted by the body at wavelength 250 nm is U1, at wavelength 500 nm is U2 and that at 1000nm is U3. Wien’s constant, b = 2.88 × 10^6 nmK. Which of the following is correct?
31
Aug
A black body is at a temperature of 5760 K. The energy of radiation emitted by the body at wavelength 250 nm is U1, at wavelength 500 nm is U2 and that at 1000nm is U3. Wien’s constant, b = 2.88 × 10^6 nmK. Which of the following is correct? A black body is at [...]
Two identical bodies are made of a material for which the heat capacity increases with temperature. One of these is at 100 C. While the other one is at 0 C. If the two bodies are brought into contact, then assuming no heat loss, the final common temperature is
31
Aug
Two identical bodies are made of a material for which the heat capacity increases with temperature. One of these is at 100 C. While the other one is at 0 C. If the two bodies are brought into contact, then assuming no heat loss, the final common temperature is the final common temperature is then [...]
Certain quantity of water cools from 70C to 60C in the first 5 minutes and to 54C in the next 5 minutes. The temperature of the surroundings is
31
Aug
Certain quantity of water cools from 70C to 60C in the first 5 minutes and to 54C in the next 5 minutes. The temperature of the surroundings is Certain quantity of water cools from 70C to 60C in the first 5 minutes and to 54C in the next 5 minutes. The temperature of the surroundings [...]
A body cools from a temperature 3T to 2T in 10 minutes. The room temperature is T. Assume that Newton’s law of cooling is applicable. The temperature of the body at the end of next 10 minutes will be
31
Aug
A body cools from a temperature 3T to 2T in 10 minutes. The room temperature is T. Assume that Newton’s law of cooling is applicable. The temperature of the body at the end of next 10 minutes will be A body cools from a temperature 3T to 2T in 10 minutes. The room temperature is [...]
On a new scale of temperature (which is linear) and called the W scale. The freezing and boiling points of water are 39 degree W and 239 degree W respectively. What will be the temperature on the new scale, corresponding to a temperature of 39 degree C on the Celsius scale?
31
Aug
On a new scale of temperature (which is linear) and called the W scale. The freezing and boiling points of water are 39 degree W and 239 degree W respectively. What will be the temperature on the new scale, corresponding to a temperature of 39 degree C on the Celsius scale? taking latent heat of [...]
Which of the following circular rods (given radius r and length l), each made of the same material and whose ends are maintained at the same temperature will conduct most heat?
31
Aug
Which of the following circular rods (given radius r and length l), each made of the same material and whose ends are maintained at the same temperature will conduct most heat? each made of the same material and whose ends are maintained at the same temperature will conduct most heat? Which of the following circular [...]
The two ends of a rod of length L and a uniform cross-sectional area A are kept at two temperatures T1 and T2(T1 T2). The rate of heat transfer, dt/dQ, through the rod in a steady state is given by :
31
Aug
The two ends of a rod of length L and a uniform cross-sectional area A are kept at two temperatures T1 and T2(T1 T2). The rate of heat transfer, dt/dQ, through the rod in a steady state is given by : dt/dQ The two ends of a rod of length L and a uniform [...]
A cylindrical metallic rod in thermal contact with two reservoirs of heat at its two ends conducts an amount of heat Q in time t. The metallic rod is melted and the material is formed into a rod of half the radius of the original rod. What is the amount of heat conducted by the new rod, when placed in thermal contact with the two reservoirs in time t ?
31
Aug
A cylindrical metallic rod in thermal contact with two reservoirs of heat at its two ends conducts an amount of heat Q in time t. The metallic rod is melted and the material is formed into a rod of half the radius of the original rod. What is the amount of heat conducted by the [...]