MHT CET 2021 23th September Morning Shift | MHT CET Year Wise Previous Years Questions

The energy of an electron in the excited hydrogen atom is $$-3.4 \mathrm{~eV}$$. Then according to Bohr's theory, the angular momentum of the electron in that excited state is ($$\mathrm{h}=$$ Plank's constant)

$$\frac{2 \pi}{h}$$

$$\frac{\mathrm{nh}}{2 \pi}$$

$$\frac{\mathrm{h}}{\pi}$$

$$\frac{3 \mathrm{~h}}{2 \pi}$$

MHT CET 2021 23th September Morning Shift

MCQ (Single Correct Answer)

-0

For a perfectly black body, coefficient of emission is

zero

infinity

unity

less than one (non-zero)

MHT CET 2021 23th September Morning Shift

MCQ (Single Correct Answer)

-0

Two rods of different metals have coefficients of linear expansion '$$\alpha_1$$' and '$$\alpha_2$$' respectvely. Their respective lengths are '$$\mathrm{L}_1$$' and '$$\mathrm{L}_2$$'. At all temperatures ($$\mathrm{L}_2-\mathrm{L}_1$$) is same. The correct relation is

$$\mathrm{L}_1 \alpha_1^2=\mathrm{L}_2 \alpha_2^2$$

$$\mathrm{L}_1^2 \alpha_1^2=\mathrm{L}_2^2 \alpha_2^2$$

$$\mathrm{L}_1 \alpha_2=\mathrm{L}_2 \alpha_1$$

$$\mathrm{L}_1 \alpha_1=\mathrm{L}_2 \alpha_2$$

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