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Bohr?s atomic model



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Q1. A metal?s work function is 3.8KJ. Photons strike metal?s surface with an energy of 5.2 KJ. what?s the kinetic energy of the emitted electrons?

(a) 3.8 KJ
(b) 5.2 KJ
(c) 9 KJ
(d) 1.4 KJ

Q2. ________ frequency, is the minimum frequency required to eject an electron when photons hit the metal surface.

(a) Required
(b) Activated
(c) Threshold
(d) Limiting

Q3. When a hydrogen atom is in its first excited level, what is the relation of radius and Bohr radius?

(a) Twice
(b) 4 times
(c) Same
(d) Half

Q4. Hydrogen atoms are excited from ground state to the state of principal quantum number 4. Then, what will be the number of spectral lines observed?

(a) 3
(b) 6
(c) 5
(d) 2

Q5. In terms of Bohr radius a0, the radius of the second Bohr orbit of a hydrogen atom is given by ?2 a0.

(a) True
(b) False
(c) Both acidolysis and aldehyde
(d) None of the mentioned

Q6. Which of the following is true regarding the Bohr model of atoms?

(a) Assumes that the angular momentum of electrons is quantized
(b) Uses Faraday?s laws
(c) Predicts continuous emission spectra for atoms
(d) Predicts the same emission spectra for all types of atoms

Q7. A hydrogen atom in its ground state absorbs 10.2 eV of energy. What is the orbital angular momentum is increased by?

(a) 4.22 ? 10-3 Js
(b) 2.11 ? 10-34 Js
(c) 3.16 ? 10-34 Js
(d) 1.05 ? 10-34 Js

Q8. What will be the longest wavelength in the Balmer series of hydrogen spectrum?

(a) 6557 ? 10-10 m
(b) 5557 ? 10-10 m
(c) 9557 ? 10-10 m
(d) 1557 ? 10-10 m

Q9. What is the order of the radius of an electron orbit in a hydrogen atom?

(a) 10-8 m
(b) 10-9 m
(c) 10-11 m
(d) 10-13 m

Q10. The radius of the Bohr orbit depends on which of the following?

(a) 1n
(b) n
(c) 1n2
(d) n2


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4 Answer
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Assertion : Cathode Rays Do Not Travel In Straight Lines. Reason : Cathode Rays Penetrate Through Thick Sheets.

Modified 240 Year Ago

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419
240 Year Ago

Assertion : Cathode Rays Do Not Travel In Straight Lines. Reason : Cathode Rays Penetrate Through Thick Sheets.

0 votes
4 Answer
413 views

E/m Ratio Was Determined By

Modified 240 Year Ago

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240 Year Ago

E/m Ratio Was Determined By

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4 Answer
395 views

Magnitude Of K.E. In An Orbit Is Caused By

Modified 240 Year Ago

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240 Year Ago

Magnitude Of K.E. In An Orbit Is Caused By

0 votes
4 Answer
340 views

The Minimum Real Charge On Any Particle Which Can Exist Is

Modified 240 Year Ago

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240 Year Ago

The Minimum Real Charge On Any Particle Which Can Exist Is

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4 Answer
332 views

Assertion : Cathode Rays Are A Stream Of α -particles. Reason : They Are Generated Under High Pressure And High Voltage.

Modified 240 Year Ago

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240 Year Ago

Assertion : Cathode Rays Are A Stream Of α -particles. Reason : They Are Generated Under High Pressure And High Voltage.

0 votes
4 Answer
321 views

The Average Distance Of An Electron In An Atom From Its Nucleus Is Of The Order Of

Modified 240 Year Ago

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240 Year Ago

The Average Distance Of An Electron In An Atom From Its Nucleus Is Of The Order Of

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