- AInfra-red
- BMicrowave
- CUltra-violet
- ✓$X-$ rays
$X$-ray wavelength is of the order of $10 \mathring A$
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Assertion $(A)$ and the other is labelled as Reason$(R)$
$Assertion$ $(A)$ : Work done by electric field on moving a positive charge on an equipotential surface is always zero.
$Reason$ $(R)$ : Electric lines of forces are always perpendicular to equipotential surfaces.
In the light of the above statements, choose the most appropriate answer from the options given below
$(i)$ Sequentially keeping in contact with $2$ reservoirs such that each reservoir supplies same amount of heat.
$(ii)$ Sequentially keeping in contact with 8 reservoirs such that each reservoir supplies same amount of heat.
In both the cases body is brought from initial temperature $100^{\circ}\,C$ to final temperature $200^{\circ}\,C$. Entropy change of the body in the two cases respectively is :