Structure of Atom · Question 60

A bulb is rated at 150 watt, converting 8% energy into light. If energy of one photon is 4.42 × 10-19 J, how many photons are emitted by the bulb per second?

1. 27.2 × 1019
2. 4.06 × 1019
3. 1.35 × 1019
4. 2.71 × 1019

Match List-I with List-II :

1. A-II, B-III, C-IV, D-I
2. A-I, B-II, C-III, D-IV
3. A-II, B-III, C-I, D-IV
4. A-IV, B-II, C-III, D-I

Consider the following schematic plots of orbital wavefunction ( r) against distance (r) from the nucleus. [figure] The figure representing two radial nodes in the orbital is

1. D
2. A
3. B
4. C

The ratio of the wavelengths of the light absorbed by a Hydrogen atom when it undergoes n = 2 n = 3 and n = 4 n = 6 transitions, respectively, is

1. 19
2. 14
3. 136
4. 116

Energy and radius of first Bohr orbit of He+ and Li2+ are [Given RH = 2.18 10-18 J, a0 = 52.9 pm]

1. En (Li2+ ) = -19.62 10-16 J; rn (Li2+ ) = 17.6 pm En (He+ ) = -8.72 10-16 J; rn (He+ ) = 26.4 pm
2. En (Li2+ ) = -8.72 10-16 J; rn (Li2+ ) = 17.6 pm En (He+ ) = -19.62 10-16 J; rn (He+ ) = 17.6 pm
3. En (Li2+ ) = -19.62 10-18 J; rn (Li2+ ) = 17.6 pm En (He+ ) = -8.72 10-18 J; rn (He+ ) = 26.4 pm
4. En (Li2+ ) = -8.72 10-18 J; rn (Li2+ ) = 26.4 pm En (He+ ) = -19.62 10-18 J; rn (He+ ) = 17.6 pm

The energy of an electron in the ground state (n = 1) for He+ ion is -x J, then that for an electron in (n = 2) state for Be3+ ion in J is

1. -x
2. - x9
3. -4x
4. - 49x

Match List I with List II. Choose the correct answer from the options given below :

1. A-I, B-III, C-II, D-IV
2. A-III, B-IV, C-I, D-II
3. A-III, B-IV, C-II, D-I
4. A-II, B-I, C-IV, D-III

The quantum numbers of four electrons are given below : I. n = 4; l = 2; ml = -2; s = - 12 II. n = 3; l = 2; ml = 1; s = + 12 III. n = 4; l = 1; ml = 0; s = + 12 IV. n = 3; l = 1; ml = -1; s = + 12 The correct decreasing order of energy of these electrons is

1. IV > II > III > I
2. I > III > II > IV
3. III > I > II > IV
4. I > II > III > IV

Given below are two statements: In the light of the above statements, choose the correct answer from the options given below:

1. Statement I is true but Statement II is false
2. Statement I is false but Statement II is true
3. Both Statement I and Statement II are true
4. Both Statement I and Statement II are false

Select the correct Statements from the following : Choose the correct answer from the options given below.

1. C, D and E only
2. A and E only
3. B, C and E only
4. A, B and C only