Tags Physics Nuclei Overview

Physics Nuclei Overview

Get insights from 23 questions on Physics Nuclei Overview, answered by students, alumni, and experts. You may also ask and answer any question you like about Physics Nuclei Overview

Follow Ask Question

Questions

Discussions

Active Users

Followers

New answer posted

5 months ago

Physics Nuclei Overview Class 12th

A radioactive sample decays with a constant of (1/3)logₑ2 s⁻¹. If initially there are 200 nuclei present, find the number of nuclei decayed during the first 9 seconds.

0 Follower 4 Views

Vishal Baghel

Contributor-Level 10

t? , half life = (log?2)/λ = 3 s
Initially 200 nuclei were there
After 3 half-lives, 9 seconds,
No. of nuclei = (1/2³) (200) = 25
Therefore, the number of nuclei that decayed = 200 – 25 = 175

0 0

New answer posted

5 months ago

Physics Nuclei Overview Class 12th

A radioactive β –emission. A detector records n β –particles in 2s and by next 2s (accumulatively) it records 1.1 n β –particle. Number of β –particles recorded by detector after a long time, is

0 Follower 1 View

Vishal Baghel

Contributor-Level 10

N = [n + n/10 + n/100 + .]
= n/ (1 - 1/10) = 10/9

0 0

New answer posted

5 months ago

Physics Nuclei Overview Class 12th

The decay of a proton to neutron is :

0 Follower 3 Views

Vishal Baghel

Contributor-Level 10

Always possible as it is associated only with β? decay

0 0

New answer posted

5 months ago

Physics Nuclei Overview Class 12th

You are given that Mass of ?Li = 7.0160u, Mass of ?He = 4.0026u and ¹H = 1.0079u. When 20 g of ?Li is converted into ?He by proton capture, the energy liberated, (in kWh), is [Mass of nucleon = 1GeV/c²]

0 Follower 37 Views

Vishal Baghel

Contributor-Level 10

Kindly consider the following figure

0 0

New answer posted

5 months ago

Physics Nuclei Overview Class 12th

The nuclear activity of a radioactive element becomes (1/8)ᵗʰ of its initial value in 30 years. The half –life of radioactive element is __________ years.

0 Follower 3 Views

alok kumar singh

Contributor-Level 10

A = A? (1/2)?
A/A? = 1/8 = (1/2)³ ⇒ n = 3
t = n T½
30 = 3 T½
T½ = 10 years

0 0

New answer posted

6 months ago

Physics Nuclei Overview Class 12th

A sample of a radioactive nucleus A disintegrates to another radioactive nucleus B, which in turns disintegrates to some other stable nucleus C. Plot of a graph showing the variation of number of atoms of nucleus B vesus time is:

(Assume that a t = 0, there are no B atoms in the sample)

0 Follower 3 Views

Raj Pandey

Contributor-Level 9

$A \to_{}^{λ_{A}} B \to_{}^{λ_{B}} C$

Amount of B,

$N_{B} = \frac{λ_{A} N_{A_{0}}}{λ_{B} - λ_{A}} [e^{- λ_{A} t} - e^{- λ_{B} t}]$

where K = $\frac{λ_{A}}{λ_{B} - λ_{A}} N_{A_{0}}$

0 0

New answer posted

6 months ago

Physics Nuclei Overview Class 12th

There are 10¹⁰ radioactive nuclei in a given radioactive element, its half-time is 1 minute. How many nuclei will remain after 30 seconds?

$(\sqrt[]{2} = 1.414)$

0 Follower 2 Views

Vishal Baghel

Contributor-Level 10

$\frac{N}{N_{0}} = {(\frac{1}{2})}^{t |_{t_{1} | 2}}$

$\Rightarrow N = 1 0^{10} * {(\frac{1}{2})}^{\frac{1}{2}} = \frac{1 0^{10}}{\sqrt[]{2}} ? 7 * 1 0^{9}$

0 0

New answer posted

6 months ago

Physics Nuclei Overview Class 12th

Read the following statements:

(A) Volume of the nucleus is directly proportional to the mass number.

(B) Volume of the nucleus is independent of mass number.

(C) Density of the nucleus is directly proportional to the mass number.

(D) Density of nucleus is directly proportional to the cube root of the mass number.

(E) Density of the nucleus is independent of the mass number.

Choose the correct option from the following options.

0 Follower 1 View

Payal Gupta

Contributor-Level 10

Radius, R = R₀A^1/3

0 0

New answer posted

6 months ago

Physics Nuclei Overview Class 12th

The half life period of a radioactive substance is 60 days. The time taken for $\frac{7}{8} t h$ of its original mass to disintegrate will be:

0 Follower 2 Views

Vishal Baghel

Contributor-Level 10

$t_{\frac{1}{2}} = 60 d a y s$

at t = 0 $\frac{m}{m_{0}} \to$ 0

$a t t \to \frac{m}{m_{0}} (1 - \frac{7}{8})$

= $\frac{m}{8 m_{0}} \to \frac{7}{8} (\frac{m}{m_{0}})$

$\Rightarrow \frac{1}{2^{3}} = \frac{1}{2^{(\frac{t}{60})}} \Rightarrow \frac{t}{60} = 3$

t = 180 days

0 0

New answer posted

6 months ago

Physics Nuclei Overview Class 12th

A sample contains 10^-2kg each of two substances A and B with half lives 4s and 8s respectively. The ration of their atomic weights is 1 : 2. The ratio of the amounts of A and B after16s is $\frac{x}{100}$ . The value of x is ______.

0 Follower 4 Views

Payal Gupta

Contributor-Level 10

$f o r A, t_{\frac{1}{2}} = 4 s e c$

$= m A_{0} e^{-} \frac{0.693}{4} * 16$

$m_{A} = m_{A 0} e^{- 4 * 0.693}$ - (1)

for B,

for B, $t_{\frac{1}{2}} = 8 s e c$

$m_{B} = m_{B_{0}} e^{- 2 * 0.693}$ - (2)

$\frac{m_{A}}{m_{B}} = \frac{m_{A O}}{m_{B O}} \frac{e^{- 4} * 0.693}{e^{- 2} * 0.693}$

$\frac{m_{A}}{m_{B}} = \frac{25}{100} = \frac{x}{100} x = 25$

0 0

Get authentic answers from experts, students and alumni that you won't find anywhere else

On Shiksha, get access to

66k Colleges
1.2k Exams
686k Reviews
1800k Answers

Community GuidelinesUser Points System

QuestionsDiscussionsTags

Need guidance on career and education? Ask our experts

Your Question

Physics Nuclei Overview

Questions

Discussions

Active Users

Followers

All

Discussions

Unanswered Questions

Share Your College Life Experience