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Rutherford's nuclear mod..



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Q1. An ?-particle of energy 10 MeV is scattered through 180o by a fixed uranium nucleus. Calculate the order of distance of the closest approach?

(a) 10-20cm
(b) 10-12cm
(c) 10-11cm
(d) 1012cm

Q2. In which of the following system, will the radius of the first orbit (n=1) be minimum?

(a) Doubly ionized lithium
(b) Singly ionized helium
(c) Deuterium atom
(d) Hydrogen atom

Q3. If an ?-particle collides head-on with a nucleus, what is its impact parameter?

(a) Zero
(b) Infinite
(c) 10-10 m
(d) 1010 m

Q4. Based on the Bohr model, what is the minimum energy required to remove an electron from the ground state of Be atom? (Given: Z = 4)

(a) 1.63 eV
(b) 15.87 eV
(c) 30.9 eV
(d) 217.6 eV

Q5. The kinetic energy of the ?-particle incident on the gold foil is doubled. The distance of closest approach will also be doubled.

(a) True
(b) False
(c)
(d)

Q6. According to Bohr?s principle, what is the relation between the principal quantum number and the radius of the orbit?

(a) r proportional to 1n
(b) r proportional to 1n2
(c) r proportional to n
(d) r proportional to n2

Q7. Which of the following did Bohr use to explain his theory?

(a) Conservation of linear momentum
(b) The quantization of angular momentum
(c) Conservation of quantum frequency
(d) Conservation of mass

Q8. Of the following pairs of species which one will have the same electronic configuration for both members?

(a) Li+ and Na+
(b) He and Ne+
(c) H and Li
(d) C and N+

Q9. What is the valence electron in alkali metal?

(a) f-electron
(b) p-electron
(c) s-electron
(d) d-electron

Q10. The atomic number of silicon is 14. Its ground state electronic configuration is

(a) 1s22s22p63s23p4
(b) 1s22s22p63s23p3
(c) 1s22s22p63s23p2
(d) 1s22s22p63s23p1


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0 Answer
427 views

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

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248 Year Ago

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

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418 views

E/m Ratio Was Determined By

Modified 248 Year Ago

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E/m Ratio Was Determined By

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402 views

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

Modified 248 Year Ago

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248 Year Ago

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

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344 views

The Minimum Real Charge On Any Particle Which Can Exist Is

Modified 248 Year Ago

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248 Year Ago

The Minimum Real Charge On Any Particle Which Can Exist Is

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342 views

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

Modified 248 Year Ago

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248 Year Ago

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

0 votes
0 Answer
324 views

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

Modified 248 Year Ago

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248 Year Ago

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

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