10 - Nuclear Physics Questions Answers

Raju is travelling in a train moving at a speed of 72 km/h.
In order to stop the
train, the driver decreases the speed. The rate of decrease in speed of the
moving body is known as deceleration or retardation.
If the deceleration of the train is 10m/s
2
, how much time will it take to come

to a stop

Asked By: SURESH 3 year ago
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Selvi goes for a morning walk in the park near her house. She starts from point ‘A’,
walks a circular path of radius 7m and returns to the same point ‘A’.
(i) What is her displacement?

(ii) Find the distance she has walked

Asked By: SURESH 3 year ago
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a particle moving with uniformacceleration describs in last second of its motion 9/5 of whole distance. if it starts from rest how long is theparticle in motion and through what distance does it move if it describes 6cm in first second

Asked By: KALYANI 3 year ago
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why does a paper ball does not go more distance with comparison with a cosco ball.

 

Asked By: AMANVERMA 5 year agoSolved By: INNOCENT STUDENT
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the half life of radium is 1620 year & its atomic weight is 226gm/mole. the number of atoms that will decay from its 1g sample per second is

1) 3.16 x 1010

2)3.6 x 1012

3) 3.1 x 1015

4) 31.1 x 1015

Asked By: HIMANSHU 6 year ago
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Answer Strategies and trick by Manish sir (it will help you to solve it by yourself)

for radioactivity we know that it is a first order process

so dN/dt = -λN

so dN/1 = -[0.6932/(1620*3.1*107)]*(1/226)*6.023*1023

solve now

A RADIOACTIVE SUBSTANCE EMITS n BETA PARTICLES IN THE FIRST 2 SECONDS & 0.5 n BETA PARTICLES IN THE NEXT 2 SECONDS . THE MEAN LIFE OF THE SAMPLE IS

ANS 2/(ln2) s 

Asked By: SARIKA SHARMA 6 year ago
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Answer Strategies and trick by Manish sir (it will help you to solve it by yourself)

A RADIOACTIVE SUBSTANCE EMITS n BETA PARTICLES IN THE FIRST 2 SECONDS & 0.5 n BETA PARTICLES IN THE NEXT 2 SECONDS. Definitely by definition its half life will be 2 sec.

so mean life = half life / ln2                  This is the relation between mean life and half life.

 

A NUCLEUS OF MASS NO. 220, INITIALLY AT REST , EMITS AN  .α PARTICLE . IF THE Q  VALUE OF THE Rxn  IS 5.5MeV THE ENERGY OF THE EMITTED α PARTICLE WILL BE ??

ANS 5.4 MeV

Asked By: SARIKA SHARMA 6 year ago
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Answer Strategies and trick by Manish sir (it will help you to solve it by yourself)

5.5*216/220 = 216/40 = 5.4 MeV                                  here 216 is the mass of nucleus after ejecting α particle.

HOW WE WILL CALCULATE 10e-2 in the ques of NUCLEAR PHY.

Asked By: SARIKA 6 year agoSolved By: NIKHIL VARSHNEY
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a sample of radioactive element has mass 10g at a instant t=0 the approximate mass of this elementcin the sample after 2

mean lives is ?

ans 1.3g

Asked By: SARIKA 6 year agoSolved By: NIKHIL VARSHNEY
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The activity of a freshly prepared  radioactive sample is 10^10 disintegrations per second, whose mean life is 10^9 sec.

The mass of an atom of this radioisotope is 10 ^ -25 kg.  The mass (in mg) of the radioactive sample is

 

Asked By: NITIN RAO 6 year ago
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Answer Strategies and trick by Manish sir (it will help you to solve it by yourself)

dN/dt = -λN

1010 = -[1/109] N                                               λ = 1/mean life

so N = 1019 disintegration

so mass of radioisotope = 1019 *10-25 = 10-6 Kg = 1 mg

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