A certain particle carries 2.5 × 10–16 C of static electric charge. The number of electrons present in it would be:

1. 1460  2. 1350
3. 1560 4. 1660

Subtopic:  Introduction of Atomic Structure |
 75%
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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

Subtopic:  Introduction of Atomic Structure |
 72%
From NCERT
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In Rutherford's experiment, generally, the thin foil of heavy atoms like gold, platinum, etc. have been used to be bombarded by the α-particles.

 If the thin foil of light atoms like aluminum etc. is used in Rutherford’s experiment, the difference that would be observed from the above results is :

1. The same results will be observed.

2. More deflection would be observed.

3. There will not be enough deflection.

4. None of the above.

Subtopic:  Introduction of Atomic Structure |
 61%
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The maximum number of neutrons are present in the nuclei of

1. O816
2. Mg1224
3. Fe2656
4. Sr3888

Subtopic:  Number of Electron, Proton & Neutron |
 92%
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The number of protons, neutrons, and electrons in  \( _{71}^{175}Lu\) 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 |
 80%
From NCERT
NEET - 2020
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The electron of a Br atom that experiences the lowest effective nuclear charge is:

1. 2p and 3p

2. 4p

3. 2p

4. 3p

Subtopic:  Number of Electron, Proton & Neutron |
 73%
From NCERT
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Which among the following are isoelectronic species?

1. Na+, K+, Ca2+, Mg2+

2. Ca2+, Mg2+, S2-, K+

3. Ca2+, Ar, S2-, K+

4. None of the above

Subtopic:  Number of Electron, Proton & Neutron |
 74%
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The energy of the photon having frequency 3×1015 Hz would be:

1. 1.988 × 10-18 J
2. 1.588 × 10-18 J
3. 1.288 × 10-18 J
4. 2.988 × 10-18 J

Subtopic:  Electromagnetic Radiation |
 88%
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Match the following:

Column I Column II
A. X-rays 1. v=100-104 Hz
B. Ultraviolet wave (UV) 2. v=1010 Hz
C. Long radio waves 3. v=1016 Hz
D. Microwave 4. v=1018 Hz
 
A B C D
1. 4 1 3 2
2. 1 4 2 3
3. 1 4 3 2
4. 4 3 1 2
Subtopic:  Electromagnetic Radiation |
 75%
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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. 102
2. 10
3. 50
4. 20

Subtopic:  Planck's Theory |
 73%
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