Download App

Laws of Thermodynamics — Physics STD 11 Science — Question

Rajasthan BoardEnglish MediumSTD 11 SciencePhysicsLaws of Thermodynamics3 Marks
Question
When an object cools down, heat is withdrawn from it. Does the entropy of the object decrease in this process? If yes, is it a violation of the second law of thermodynamics stated in terms of increase in entropy?
✓

Answer

When an object cools down, heat is withdrawn from it. Hence, the entropy of the object decreases. But the decrease in entropy leads to the transfer of energy to the surrounding. The second law is not violated here, which states that entropy of the universe always increases as the net entropy increases.
Here,
Net entropy = Entropy of object + Entropy of surrounding

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Explore more

More "3 Marks Question" from Laws of Thermodynamics→Laws of Thermodynamics — all question types→Physics STD 11 Science question papers→Rajasthan Board STD 11 Science question papers→Rajasthan Board question paper generator→

Similar questions

A person travels on a spaceship moving at a speed of $\frac{5\text{c}}{13}$
  1. Find the time interval calculated by him between the consecutive birthday celebrations of his friend on the earth.
  2. Find the time interval calculated by the friend on the earth between the consecutive birthday celebrations of the traveller.
→
If the Earth were to suddenly contract to $\frac{1}{\text{n}}^{\text{th}}$ of its present radius, without any change in its mass, then what will be the effect on the duration of the day?
→
Three rods of equal length $L$ and equal cross-sectional area $A$ are connected in series. The thermal conductivities of their substances are $K , 2 K$ and $1.5 K.$ If the temperature of the open ends of the first and last rods are $200^{\circ} C$ and $18^{\circ} C$ then calculate the temperature at both the junctions whereas the radiation of heat loss is negligible.
→
A black body at 2000K emits maximum energy at a wavelength of $1.56\mu\text{m}.$ At what temperature will it emit maximum energy at a wavelength of $1.8\mu\text{m}\ ?$
→
Explain why.
There is fall in temperature with increase in altitude.
→
A particle is released from the top of an incline of height h. Does the kinetic energy of the particle at the bottom of the incline depend on the angle of incline? Do you need any more information to answer this question in Yes or No?
→
What is the excess pressure inside a bubble of soap solution of radius 5.00 mm given that the surface tension of soap solution at the temperature $\left(20^{\circ} C \right)$ is $2.50 \times 10^{-2} N m ^{-1}$ ? If an air bubble of the same dimension were formed at depth of 40.0 cm inside a container containing the soap solution (of relative density 1.20 ), what would be the pressure inside the bubble? ( 1 atmospheric pressure is $1.01 \times 10^{-5} Pa$ ).
→
Can an electromagnetic wave be polarised?
→
Write the difference between ideal gas and real gas.
→
The gravitational potential energy of a two particle system is derived in this chapter as $\text{U}=-\frac{\text{Gm}_1\text{m}_2}{\text{r}}.$ Does it follow from this equation that the potential energy for $\text{r}=\infty$ must be zero? Can we choose the potential energy for $\text{r}=\infty.$ to be 20J and still use this formula? If no, what formula should be used to calculate the gravitational potential energy at separation r?
→