Atoms and Nuclei Test

Result

Atoms and Nuclei Test - 75

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Weekly Quiz Competition

Question 1
4 / -1

Light form the discharge tube containing hydrogen atom falls on the surface of a piece of sodium. The kinetic energy of the fastest photo electrons emitted form sodium is 0.73 eV. The work function for sodium is 1.82 eV. Ionisation Potential of hydrogen is 13.6 v and the mass of hydrogen atom is 1.67 × 10^–27 Kg
The recoil speed of emitting atom causing that is at lest before the transition is of the order of

A
1 cms^–1<.sup>

B
10² ms^–1

C
10⁴ ms^–1

D
1² ms^–1

Solution
Question 2
4 / -1

A and B are two radioactive substane whose half lives are 1 and 2 years respectively. Initially 10 g of A and 1 g of B is taken. The time after which they will have same quantity remaining is

A
3.6 years

B
7 years

C
6.6 years

D
5 years

Solution
Question 3
4 / -1

The activity of a sample of a radio- active material is at time t₁ and A₂ at time t₂ (where t₂ > t₁) if T its mean life is then

A
A₁t₁ = A₂ t₂

B

C

D

Solution
Question 4
4 / -1

A
90 , 234

B
92 , 236

C
88 , 234

D
91 , 234

Solution
Question 5
4 / -1

gf ₉₂U²³⁸ undergoes sucesively 8 α decays and 6 β decays then resulting nucleus is

A
Pb²⁰⁶

B
Pb²⁰⁸

C
Pb²¹⁴

D
None of these

Solution
Question 6
4 / -1

The energy released by the fission of one uranium atom is 200 MeV. The number of fission Per second required to Produce 3.2 w of Power is

A
10¹⁰

B
10⁷

C
10¹²

D
10¹¹

Solution
Question 7
4 / -1

Radio carbon dating is done by estimating in the specimen

A
the amount of oridinary carbon still present

B

C
the amount of radio carbon still Present

D
None of these
Question 8
4 / -1

The total energy of the electron in the first excited state of hydrogen is –3.4 eV. what is the kinetic energy of the electron in this state?

A
6.8 eV

B
3.4 eV

C
–3.4 eV

D
–6.8 eV

Solution
Question 9
4 / -1

The wave length of second line of Balmer series is 486.4 nm. what is the wave length of the first line of lyman series ?

A
364.8 nm

B
729.6 nm

C
121.6 nm

D
None of these

Solution
Question 10
4 / -1

The innermost orbit of the hydrogen atom has a radius 0.53 A. what is radius of 2^nd orbit is ?

A
2.12Å

B
1.06Å

C
21.2Å

D
10.6Å

Solution