The velocities of two particles A and B are 0.05 and 0.02 ms–1 respectively.The mass of B is five times the mass of A. The ratio of their de-Broglie's wavelength is
2:1
1:4
1:1
4:1
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The electrons, identified by quantum numbers n and l(i) n = 4, l = 1
(ii) n = 4, l = 0
(iii) n = 3, l = 2
(iv) n = 3, l = 1
can be placed in order of increasing energy, from the lowest to highest, as: