The energy of radiation emitted from a black body is not same for all wavelength hence option $(c)$ is wrong.
Plank’s law relates the wavelength ($\lambda$) and temperature $(T)$ according to the relation
${E_\lambda }{d_\lambda } = \frac{{8\pi \,hc}}{{{\lambda ^5}}}\frac{1}{{[{e^{hc/kT}} - 1]}}{d_\lambda }$. Hence option $(d)$ is correct.
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They use different lengths of the pendulum and /or record time for different number of oscillations. The observations are shown in the table.
Least count for length $=0.1 \mathrm{~cm}$
Least count for time $=0.1 \mathrm{~s}$
| Student | Length of the pendulum $(cm)$ | Number of oscillations $(n)$ | Total time for $(n)$ oscillations $(s)$ | Time period $(s)$ |
| $I.$ | $64.0$ | $8$ | $128.0$ | $16.0$ |
| $II.$ | $64.0$ | $4$ | $64.0$ | $16.0$ |
| $III.$ | $20.0$ | $4$ | $36.0$ | $9.0$ |
If $\mathrm{E}_{\mathrm{I}}, \mathrm{E}_{\text {II }}$ and $\mathrm{E}_{\text {III }}$ are the percentage errors in g, i.e., $\left(\frac{\Delta \mathrm{g}}{\mathrm{g}} \times 100\right)$ for students $\mathrm{I}, \mathrm{II}$ and III, respectively,
$n + \,_{92}^{235}U \to \,_{56}^{144}Ba + .... + 3n$