# 10 - Nuclear Physics Questions Answers

to a stop

**Asked By: SURESH**4 year ago

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(ii) Find the distance she has walked

**Asked By: SURESH**4 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**4 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**6 year ago

**Solved 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 10^{10}

2)3.6 x 10^{12}

3) 3.1 x 10^{15}

4) 31.1 x 10^{15}

**Asked By: HIMANSHU**7 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*10^{7})]*(1/226)*6.023*10^{23}

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**7 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**7 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**7 year ago

**Solved 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**7 year ago

**Solved 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**7 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

10^{10} = -[1/10^{9}] N λ = 1/mean life

so N = 10^{19 }disintegration

so mass of radioisotope = 10^{19} *10^{-25 }= 10^{-6} Kg = 1 mg