Which of the following statements is true/correct
Which of the following statements is true/correct
- A
During clear nights, the temperature rises steadily upward near the ground level
- B
Newton's law of cooling, an approximate form of Stefan's law, is valid only for natural convection
- C
The total energy emitted by a black body per unit time per unit area is proportional to the square of its temperature in the Kelvin scale
- D
Two spheres of the same material have radii $1m$ and ${S_1}$ and temperatures $4000 K$ and $2000 K$ respectively. The energy radiated per second by the first sphere is greater than that radiated per second by the second sphere
Similar Questions
Two bodies $A$ and $B$ of equal masses, area and emissivity cooling under Newton's law of cooling from same temperature are represented by the graph. If $\theta$ is the instantaneous temperature of the body and $\theta_0$ is the temperature of surroundings, then relationship between their specific heats is ..........
Two bodies $A$ and $B$ of equal masses, area and emissivity cooling under Newton's law of cooling from same temperature are represented by the graph. If $\theta$ is the instantaneous temperature of the body and $\theta_0$ is the temperature of surroundings, then relationship between their specific heats is ..........
Certain quantity of water cools from $70^o C$ to $60^o C$ in the first $5$ minutes and to $54^o C$ in the next $5$ minutes. The temperature of the surroundings is ..... $^oC$
Certain quantity of water cools from $70^o C$ to $60^o C$ in the first $5$ minutes and to $54^o C$ in the next $5$ minutes. The temperature of the surroundings is ..... $^oC$
- [AIPMT 2014]
Hot water cools from ${60^o}C$ to ${50^o}C$ in the first $10$ minutes and to ${42^o}C$ in the next $10$ minutes. The temperature of the surrounding is ......... $^oC$
Hot water cools from ${60^o}C$ to ${50^o}C$ in the first $10$ minutes and to ${42^o}C$ in the next $10$ minutes. The temperature of the surrounding is ......... $^oC$
A calorimeter of mass $0.2$ kg and specific heat $900 J/kg-K$ . Containing $0.5$ kg of a liquid of specific heat $2400J /kg-K$ . Its temperature falls from ${60^o}C\,{\rm{to}}\,\,{\rm{5}}{{\rm{5}}^{\rm{o}}}C$ in one minute. The rate of cooling is ....... $J/s$
A calorimeter of mass $0.2$ kg and specific heat $900 J/kg-K$ . Containing $0.5$ kg of a liquid of specific heat $2400J /kg-K$ . Its temperature falls from ${60^o}C\,{\rm{to}}\,\,{\rm{5}}{{\rm{5}}^{\rm{o}}}C$ in one minute. The rate of cooling is ....... $J/s$
A liquid in a beaker has temperature $\theta (t)$ at time $t$ and $\theta_0$ is temperature of surroundings, then according to Newton's law of cooling the correct graph between loge $log_e(\theta - \theta_0) $ and $t$ is
A liquid in a beaker has temperature $\theta (t)$ at time $t$ and $\theta_0$ is temperature of surroundings, then according to Newton's law of cooling the correct graph between loge $log_e(\theta - \theta_0) $ and $t$ is
- [AIEEE 2012]