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Physics Part-II

Nuclei

(a) Two stable isotopes of lithium _{3}^{6}{Li} and _{3}^{7}{L

Physics Part-II

Class 12

NCERT

Chapter 1: Ray Optics and Optical Instruments

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Chapter 2: Wave Optics

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Chapter 4: Atoms

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Chapter 5: Nuclei

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(a) Two stable isotopes of lithium

_{3}^{6} Li

and

_{3}^{7} Li

have respective abundances of 7.5% and 92.5%. These isotopes have masses 6.01512 u and 7.01600 u, respectively. Find the atomic mass of lithium.

(b) Boron has two stable isotopes,

_{5}^{10} B

and

_{5}^{11} B

. Their respective masses are 10.01294 u and 11.00931 u, and the atomic mass of boron is 10.811 u. Find the abundances of

_{5}^{10} B

and

_{5}^{11} B

The three stable isotopes of neon:

_{10}^{20} Ne

_{10}^{21} Ne

and

_{10}^{22} Ne

have respective abundances of 90.51%, 0.27% and 9.22%. The atomic masses of the three isotopes are 19.99 u, 20.99 u and 21.99 u, respectively. Obtain the average atomic mass of neon.

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Chapter 6: Semiconductor Electronics: Materials, Devices and Simple Circuits

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Solving time: 5 mins

(a) Two stable isotopes of lithium $_{3}^{6} Li$ and $_{3}^{7} Li$ have respective abundances of 7.5% and 92.5%. These isotopes have masses 6.01512 u and 7.01600 u, respectively. Find the atomic mass of lithium.

(b) Boron has two stable isotopes, $_{5}^{10} B$ and $_{5}^{11} B$ . Their respective masses are 10.01294 u and 11.00931 u, and the atomic mass of boron is 10.811 u. Find the abundances of $_{5}^{10} B$ and $_{5}^{11} B$ B.

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Updated on: May 18, 2022

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Physics Part-II (NCERT)

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Daniel Discussed

(a) Two stable isotopes of lithium

_{3}^{6} Li

and

_{3}^{7} Li

have respective abundances of 7.5% and 92.5%. These isotopes have masses 6.01512 u and 7.01600 u, respectively. Find the atomic mass of lithium.

(b) Boron has two stable isotopes,

_{5}^{10} B

and

_{5}^{11} B

. Their respective masses are 10.01294 u and 11.00931 u, and the atomic mass of boron is 10.811 u. Find the abundances of

_{5}^{10} B

and

_{5}^{11} B

9 mins ago

Discuss this question LIVE

9 mins ago

Text solutionVerified

(a)The atomic mass is given by,

m = \frac{7.5 \times 6.01512 + 92.5 \times 7.01600}{100} = 6.941 u

(b) Mass of

_{5}^{10} B, m_{1} = 10.01294 u

Mass of

_{5}^{11} B, m_{2} = 11.00931 u

Let the abundance percentage of isotopes of boron,

_{5}^{10} B = x %

and

_{5}^{11} B = (100 - x) %

The atomic mass of Boron,

m = 10.811 u

m = \frac{m _{1} x _{1} + m _{2} x _{2}}{m _{1} + m _{2}}

So,

x = 19.89%; 100 - x = 80.11%

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Practice more questions from Physics Part-II (NCERT)

(a) Two stable isotopes of lithium

_{3}^{6} Li

and

_{3}^{7} Li

have respective abundances of 7.5% and 92.5%. These isotopes have masses 6.01512 u and 7.01600 u, respectively. Find the atomic mass of lithium.

(b) Boron has two stable isotopes,

_{5}^{10} B

and

_{5}^{11} B

. Their respective masses are 10.01294 u and 11.00931 u, and the atomic mass of boron is 10.811 u. Find the abundances of

_{5}^{10} B

and

_{5}^{11} B

The three stable isotopes of neon:

_{10}^{20} Ne

_{10}^{21} Ne

and

_{10}^{22} Ne

have respective abundances of 90.51%, 0.27% and 9.22%. The atomic masses of the three isotopes are 19.99 u, 20.99 u and 21.99 u, respectively. Obtain the average atomic mass of neon.

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Question Text	(a) Two stable isotopes of lithium $_{3}^{6} Li$ and $_{3}^{7} Li$ have respective abundances of 7.5% and 92.5%. These isotopes have masses 6.01512 u and 7.01600 u, respectively. Find the atomic mass of lithium. (b) Boron has two stable isotopes, $_{5}^{10} B$ and $_{5}^{11} B$ . Their respective masses are 10.01294 u and 11.00931 u, and the atomic mass of boron is 10.811 u. Find the abundances of $_{5}^{10} B$ and $_{5}^{11} B$ B.
Updated On	May 18, 2022
Topic	Nuclei
Subject	Physics
Class	Class 12
Answer Type	Text solution:1 Video solution: 5
Upvotes	641
Avg. Video Duration	7 min

Text solutionVerified

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