Question

13. The energy state with n=1 has the energy of (a) +13.6 eV (c)-13.6 eV (b) -1.51eV (d) None 14. The Zeeman effect relates to (a) Splitting of spectral lines in a strong magnetic field. (b) Splitting of spectral lines in a strong electric field. (c) Both (d) None 15. The Uncertainty principle explains (a) Ax Apx 2h/21 (c) Ax Aph/rt (b) Ax Apx 2h/41 (d) None of the above 16. Moseley Plot explains the relationship between (a) 1/a Vs. Z (c) Vī vs. Z (b) Vă Vs. Z (d) None 17. Average radius (r) of nucleus is (a) roA1/2 (c) ro 41/4 (b) ro A1/3 (d) None 18. The radioactive decay constant (2) is related to the half-life (T1/2) by (a) 0.693/T1/2 (c) 1.386/ T12 (b) 1/T12 (d) None 19. All stars generate energy through (a) fusion (c) Both (b) fission (d) None of the above 20. The strong force is mediated by (a) Gluon (c) Meson (b) Photon (d) None

Answer 1

13. (c)

The formula for n-th energy state is given by E_n = -E₀/n² where E₀=+13.6 eV. Therefore, the value of E₁ is:

$E_{1}=-13.6/(1)^2=-13.6\:eV$

14. (a)

Zeeman Effect is the splitting of spectral lines in a strong magnetic field.

15. (b)

The uncertainty principle states that the position and the momentum of an object cannot both be measured exactly, at the same time, even in theory.

The principle gives the relation between the uncertainty in position (Δx) and the uncertainty in momentum (Δp), as follows:

$\bigtriangleup x.\bigtriangleup p_{x}\geq \frac{h}{4\pi}$

16. (a)

Moseley Plot explains the relationship between:$1/\sqrt{\lambda},Z$

17. (b)

Average Radius(r) of nucleus is r₀A^1/3.

18. (a)

The radioactive decay constant (λ) is related to half-life (T_1/2) by:

$\lambda=\frac{0.693}{T_{1/2}}$

19. (a)

All stars generate energy through fusion.

20. (a)

The strong force is mediated by Gluon.