# The wavelength of an electron moving with a velocity of 2.05 × 107 m s-1  would be:   $$1 .$$ $$4 . 65$$ $$\times$$ $$\left(10\right)^{- 12}$$ $$m$$ $$2 .$$ $$3 . 55$$ $$\times$$ $$\left(10\right)^{-11}$$ $$m$$ $$3 .$$ $$2 . 34$$ $$\times$$ $$\left(10\right)^{11}$$ $$m$$ $$4 .$$ $$6 . 43$$ $$\times$$ $$\left(10\right)^{ -11}$$ $$m$$

Subtopic:  De Broglie Equation |
77%
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The kinetic energy of an electron is $$3.0 \times 10^{-25}~ \mathrm J.$$ Its wave length would be:

 1 $$8.96 \times 10^{-7}~ \mathrm m$$ 2 $$4.37 \times 10^{-6}~ \mathrm m$$ 3 $$1.32 \times 10^{-7}~ \mathrm m$$ 4 $$2.89 \times 10^{-4}~ \mathrm m$$
Subtopic:  De Broglie Equation |
55%
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The lowest value of n for 'g' orbitals is :
1. 4
2. 5
3. 3
4. 1

Subtopic:  Shell & Subshell |
71%
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An atom of an element contains 29 electrons and 35 neutrons. The number of protons in the element would be:

 1 29 2 35 3 6 4 64
Subtopic:  Number of Electron, Proton & Neutron |
83%
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If the diameter of a carbon atom is 0.15 nm, the number of carbon atoms that can be placed side by side in a straight line across the length of the scale of length 20 cm long will be:

 1 1.33 × 107 2 5.46 × 108 3 1.33 × 109 4 2.36 × 108



Subtopic:  Introduction of Atomic Structure |
70%
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The charge on the oil drop is –1.282 × 10–18C. The number of electrons present in it would be :

1. 15

2. 8

3. 2

4. 6

Subtopic:  Number of Electron, Proton & Neutron |
81%
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An element with a mass number of 81 contains 31.7% more neutrons as compared to protons. The atomic symbol of the element would be

$1.$ ${}_{35}{}^{81}\mathrm{Br}$
$2.$ ${}_{36}{}^{81}\mathrm{Br}$
$3.$ ${}_{35}{}^{79}\mathrm{Br}$
$4.$ ${}_{36}{}^{79}\mathrm{Br}$

Subtopic:  Number of Electron, Proton & Neutron |
67%
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An ion with a mass number of 56 contains 3 units of positive charge and 30.4% more neutrons than electrons. The symbol of the ion is -

$1.$ ${}_{26}{}^{56}\mathrm{Fe}^{+3}$
$2.$ ${}_{26}{}^{57}\mathrm{Fe}^{+3}$
$3.$ ${}_{27}{}^{58}\mathrm{Fe}^{+3}$
$4.$ ${}_{25}{}^{56}\mathrm{Fe}^{+3}$

Subtopic:  Number of Electron, Proton & Neutron |
67%
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A nitrogen laser produces radiation at a wavelength of 337.1 nm. If the number of
photons emitted is 5.6 × 10
24, the power of the laser is:

$1.$ $4.56$ $×$ ${10}^{7}$ $\mathrm{J}$
$2.$ $3.33$ $×$ ${10}^{6}$ $\mathrm{J}$
$3.$ $1.29$ $×$ ${10}^{6}$ $\mathrm{J}$
$4.$ $9.17$ $×$ ${10}^{5}$ $\mathrm{J}$

Subtopic:  Planck's Theory |
74%
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If the photon detector receives a total of 3.15$×{10}^{-18}$ J from the radiation of 600 nm,
the number of photons received by the detector would be:

$1.$ ${10}^{2}$
$2.$ $10$
$3.$ $50$
$4.$ $20$

Subtopic:  Planck's Theory |
73%
From NCERT
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