COMEDK 2024 Evening Shift | Atoms and Nuclei Question 2 | Physics

If an electron in a hydrogen atom jumps from the third orbit to the second orbit, it emits a photon of wavelength $$\lambda$$. When it jumps from the second to the first orbit, the corresponding wavelength of the photon will be

$$ \frac{5 \lambda}{27} $$

$$ \frac{7 \lambda}{20} $$

$$ \frac{16 \lambda}{9} $$

$$ \frac{20 \lambda}{7} $$

COMEDK 2024 Evening Shift

MCQ (Single Correct Answer)

-0

An electron has a mass of $$9.1 \times 10^{-31} \mathrm{~kg}$$. It revolves round the nucleus in a circular orbit of radius $$0.529 \times 10^{-10} \mathrm{~m}$$ at a speed of $$2.2 \times 10^6 \mathrm{~ms}^{-1}$$. The magnitude of its angular momentum is

$$1.06 \times 10^{-34} \mathrm{Kg} \mathrm{m}^2 \mathrm{~s}^{-1}$$

$$1.06 \times 10^{-24} \mathrm{Kg} \mathrm{m}^2 \mathrm{~s}^{-1}$$

$$2.06 \times 10^{-34} \mathrm{Kg} \mathrm{m}^2 \mathrm{~s}^{-1}$$

$$2.06 \times 10^{-24} \mathrm{Kg} \mathrm{m}^2 \mathrm{~s}^{-1}$$

COMEDK 2024 Evening Shift

MCQ (Single Correct Answer)

-0

$$ \text { If the nuclear radius of }{ }^{27} \mathrm{Al} \text { is } 3.6 \text { fermi, the nuclear radius of }{ }^{125} \mathrm{Fe} \text { is } $$

$$6 \times 10^{-10} \mathrm{~m}$$

$$6 \times 10^{-13} \mathrm{~m}$$

$$6 \times 10^{-15} \mathrm{~m}$$

$$6 \times 10^{-12} \mathrm{~m}$$

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