# Which one of the following electrons in the ground state will have least amount of energy? 1. An electron in hydrogen atom. 2. An electron in 2p orbital of carbon atom. 3. The electron of copper atom present in 4s orbital. 4. The outermost electron in sodium atom.

Subtopic:  AUFBAU Principle |
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A monochromatic infrared range finder of power 1mW emits photons with wavelength 1000 nm in 0.1 second. The number of photons emitted in 0.1 second is-
(Given -h = $$6.626 \times 10^{-34} J~s$$ , $$c = 3 \times 10^8 m~s^{-1},$$ Avogadro number = $$6.022 \times 10^{23}$$)
1. $$30 \times 10^{37}$$
2. $$5 \times 10^{14}$$
3. $$30 \times 10^{34}$$
4. $$5 \times 10^{11}$$

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Match List-I with List-II:
 List-I (quantum number) List-II (Orbital) (a) n = 2, $$\ell$$ = 1 (i) 2s (b) n = 3, $$\ell$$ = 2 (ii) 3s (c) n = 3, $$\ell$$ = 0 (iii) 2p (d) n = 2, $$\ell$$ = 0 (iv) 3d
Choose the correct answer from the options given below :
 (a) (b) (c) (d) 1 (iii) (iv) (i) (ii) 2 (iv) (iii) (i) (ii) 3 (iv) (iii) (ii) (i) 4 (iii) (iv) (ii) (i)
Subtopic:  Shell & Subshell |
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When electromagnetic radiation of wavelength 300 nm falls on the surface of a metal, electrons are emitted with the kinetic energy of 1.68 × 105 J mol–1. What is the minimum energy needed to remove an electron from the metal?
(h = 6.626 × 10–34 Js, c = 3 × 108 ms–1, NA = 6.022 × 1023 mol–1)
1.  2.31 × 106 J mol–1
2.  3.84 × 104 J mol–1
3.  3.84 × 10–19 J mol–1
4.  2.31 × 105 J mol–1
Subtopic:  Photo Electric Effect |
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If radius of second Bohr orbit of the $$He^+$$ ion is 105.8 pm, what is the radius of third Bohr orbit of $$Li^{2+}$$ ion?
1. 158.7 Å
2. 158.7 pm
3. 15.87 pm
4. 1.587 pm
Subtopic:  Hydrogen Spectra |
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A particular station of All India Radio, New Delhi, broadcasts on a frequency of 1,368 kHz (kilohertz). The wavelength of the electromagnetic radiation emitted by the transmitter is : [speed of light, ]

1. 2192 m

2. 21.92 cm

3. 219.3 m

4. 219.2 m

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The number of angular nodes and radial nodes in 3s orbital are

1. 0 and 2, respectively

2. 1 and 0, respectively

3. 3 and 0, respectively

4. 0 and 1, respectively

Subtopic:  Nodal Plane |
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The number of protons, neutrons and electrons in ${}_{71}{}^{175}\mathrm{Lu}$, respectively, are:

1.  104, 71 and 71

2.  71, 71 and 104

3.  175, 104 and 71

4.  71, 104 and 71

Subtopic:  Introduction of Atomic Structure | Number of Electron, Proton & Neutron |
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In hydrogen atom, what is the de Broglie wavelength of an electron in the second Bohr orbit is: [Given that Bohr radius, ]

(1) 211.6 pm

(2) 211.6 $\mathrm{\pi }$pm

(3) pm

(4) 105.8 pm

Subtopic:  Bohr's Theory |
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Orbital having 3 angular node and 3 total nodes is:
1. 5 p
2. 3 d
3. 4 f
4. 6 d

Subtopic:  Nodal Plane |
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