Question 644: Thermodynamics & KTG

Question

The following graph represents the radiant power versus wavelength of the black body. The area under the curve represents
![](https://app-content.cdn.examgoal.net/fly/@width/image/jaoe38c1meu7se6r/9c09ea1b-52bd-4898-b0c7-89b2505a246d/67e7c230-8366-11f0-9311-29d163b3c052/file-jaoe38c1meu7se6s.png?format=png)

Accepted Answer

In a cyclic process, the system returns to its initial state. According to the first law of thermodynamics,
$ \Delta U = Q - W $
where $\Delta U$ is the change in internal energy, $Q$ is the heat given to the system, and $W$ is the work done by the system.
For a cyclic process:
The system returns to its original state, so $ \Delta U = 0 $.
So,
$ 0 = Q - W \implies Q = W $
Correct answer:
Option B: equal to the heat given to the system.

Answer

the maximum wavelength emitted by the object.

Answer

the minimum wavelength emitted by the object.

Answer

the total energy emitted per unit time by the black body at some particular wavelength

Answer

the total energy emitted per unit time per unit area by the black body at all wavelengths.

Thermodynamics & KTG

The following graph represents the radiant power versus wavelength of the black body. The area under the curve represents

Choose the correct answer: