Yellow light emitted from a sodium lamp has a wavelength (λ) of 580 nm.
The frequency (ν) and wave number of this yellow light would be, respectively:
1. 517 x 1014 s-1 , 172 x 106 m-1
2. 6.17 x 1014 s-1 , 1.72 x 106 m-1
3. 4.17 x 1014 s-1 , 2.72 x 106 m-1
4. 5.17 x 1014 s-1 , 1.72 x 106 m-1
The energy of the photon with a frequency of 3×1015 Hz is :
1. 1.988 × J
2. 1.588 × J
3. 1.288 × J
4. 2.988 × J
A photon of wavelength 4 × 10–7 m strikes a metal surface, the work function of the metal being 2.13 eV. The kinetic energy of emission would be:
1. | 0.97 eV | 2. | 97 eV |
3. | 4.97 × eV | 4. | 5.84 × 105 eV |
The wavelength of the light emitted when the electron returns to the ground state in the H atom, from n = 5 to n = 1, would be: (The ground-state electron energy is –2.18 × 10-18 j)
1. Wavelength = 9.498 x 10-8 km
2. Wavelength = 12.498 x 10-8 m
3. Wavelength = 9.498 x 10-8 m
4. Wavelength = 9.498 x 10-8 cm
The possible values of n, l, and m for the electron present in 3d would be respectively:
1. n = 3, l = 1, m = – 2, – 1, 3, 1, 2
2. n = 3, l = 3, m = – 2, – 1, 0, 1, 2
3. n = 3, l = 2, m = – 2, – 1, 0, 1, 2
4. n = 5, l = 2, m = – 2, – 1, 0, 1, 2
The number of electrons in the species , are respectively:
1. 15, 2, 1
2. 15, 1, 2
3. 1, 2, 15
4. 2, 1, 15
The set of quantum numbers which represent 3p is
1. n =1, l =0;
2, n = 3; l=1
3. n = 4; l =2;
4. n = 4; l = 3
Which of the following sets of quantum numbers is possible-
1. n = 0, l = 0, ml = 0, ms = + ½
2. n = 1, l = 0, ml = 0, ms = – ½
3. n = 1, l = 1, ml = 0, ms = + ½
4. n = 3, l = 3, ml = –3, ms = + ½
The total number of electrons in an atom with the following quantum numbers would be
(a) n = 4, ms = – ½ (b) n = 3, l = 0
1. 16, 2
2. 11, 8
3. 16, 8
4. 12, 7