Structure of Atom

The value of Planck's constant is 6.63 10-34 J s. The velocity of light is 3.0 108 m s-1. Which value is closest to the wavelength in nanometers of a quantum of light with frequency of 8 1015 s-1 ?

1. 2 10-25
2. 5 10-18
3. 4 101
4. 3 107

In hydrogen atom, energy of first excited state is -3.4 eV. Then find out K.E. of same orbit of hydrogen atom

1. +3.4 eV
2. +6.8 eV
3. -13.6 eV
4. +13.6 eV

23592U, nucleus absorbs a neutron and disintegrates into 13954Xe, 9438Sr and x so, what will be product x?

1. 3-neutrons
2. 2-neutrons
3. -particle
4. -particle

The following quantum numbers are possible for how many orbitals : n = 3, l = 2, m = +2 ?

1. 1
2. 2
3. 3
4. 4

If a abX species emits first a positron, then two and two particles and in the last, one is also emitted and gets converted to cdY species. So correct relation is

1. c = a - 12, d = b - 5
2. c = a - 5, d = b - 1
3. c = a - 6, d = b - 0
4. c = a - 4, d = b - 2

For given energy, E = 3.03 10-19 Joules corresponding wavelength is (h = 6.626 10-34 J sec, c = 3 108 m/sec)

1. 65.6 nm
2. 6.56 nm
3. 3.4 nm
4. 656 nm

Isoelectronic species are

1. CO, CN-, NO+, C22-
2. CO-, CN, NO, C2-
3. CO+, CN+, NO-, C2
4. CO, CN, NO, C2