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Jeneeta Eliza John
Subject: Physics
, asked on 1/5/18
Q.28. Two radioactive substances A and B initially contain equal number of nuclei. A has half life of hour and B has a half life of 3 hour. After 6 hour, the ratio of activity of A to that of B is
(1)
$\frac{3}{16}$
(2)
$\frac{13}{15}$
(3)
$\frac{7}{15}$
(4)
$\frac{5}{13}$
Answer
1
Aparna Sahu
Subject: Physics
, asked on 18/4/18
Solve qus no. 5:
5. An alpha particle having kinetic energy of 10 MeV is moving towards a stationary nucleus of atomic number 50. The distance of closest approach will be.
(a) 1.44 x 10
^{-15}
m (b) 1.44 x 10
^{-15}
m
(c) 1.44 x 10
^{-13}
m (d) 14.4 x 10
^{-16}
m
Answer
2
Aparna Sahu
Subject: Physics
, asked on 14/4/18
Solve qus no. 27
Answer
3
Manasi Mujumdar
Subject: Physics
, asked on 31/3/18
ans plss
Q.15. An ideal gas with adiabatic constant 5/3 is heated at constant pressure till its volume becomes double. Then the same gas is heated at constant volume till its pressure is doubled. The average value of C (molar heat capacity) for the complete process is
A)
$\frac{9}{2}$
R
B)
$\frac{13}{6}$
R
C) 3 R
D)
$\frac{11}{6}$
R
Answer
1
Aparna Sahu
Subject: Physics
, asked on 23/3/18
Solve this.
Q.
The time it will take a certain radioactive material with a half-life of 50 days to reduce to 1/32 of its original number is
Answer
1
Shubhrajyoti Ghosh
Subject: Physics
, asked on 16/3/18
No links please
Q). Prove that sensitivity of a Galvanometer is maximum when deflection is 45
$\xb0$
.
Answer
1
Tanya Pandey
Subject: Physics
, asked on 5/3/18
200 mg of a radioactive sample reduces to 180 mg in 1000 days calculate the decay constant and half Life
Answer
1
Nithyashrri Saravanan
Subject: Physics
, asked on 5/3/18
A 1000 MW fission reactor consumes half of its fuel in 500 y. How much
${}_{92}{}^{235}\mathrm{u}$
did it contain initially? Assume the reactor operates 80% of the time, that all the energy generated arises from the fission of
${}_{92}{}^{235}\mathrm{u}$
and that this nuclide is consumed only by the fission process.
Answer
1
Afnaan Sayed
Subject: Physics
, asked on 5/3/18
Please can you answer this
Q73. Complete the following nuclear reactions
(i)
${}_{5}{}^{10}\mathrm{B}+{}_{0}{}^{1}\mathrm{n}\to {}_{2}{}^{4}\mathrm{He}+$
.................
(ii)
${}_{42}{}^{94}\mathrm{Mo}+{}_{1}{}^{2}\mathrm{H}\to {}_{43}{}^{95}\mathrm{Te}+$
................
Answer
2
Rayyan Mansuri
Subject: Physics
, asked on 5/3/18
24) The half life of a radioactive element is 2 hr. and that of the other is 4 hr. Their initial activities are equal. After 4 hrs what will be the ratio of their activities?
$\left(A\right)1:2\phantom{\rule{0ex}{0ex}}\left(B\right)1:1\phantom{\rule{0ex}{0ex}}\left(C\right)1:4\phantom{\rule{0ex}{0ex}}\left(D\right)1:3$
Answer
1
Afnaan Sayed
Subject: Physics
, asked on 2/3/18
Write the equations for the two types of B-decau .Why is it veey difficult to detect the neutrino ?
Answer
1
Kurian J
Subject: Physics
, asked on 2/3/18
how to find the mass defect of 0xeygen
Answer
1
Jeneeta Eliza John
Subject: Physics
, asked on 1/3/18
How much uranium
${}_{92}{}^{235}\mathrm{U}$
should be consumed in a nuclear reactor for giving power of 10
^{6}
watt, if the energy released per fission is 200 MeV?
Answer
1
Jeneeta Eliza John
Subject: Physics
, asked on 1/3/18
One MeV positron encounters 1 MeV electron travelling in opposite directions. What is the wavelength of photons produced? Given rest mass energy of electron or positron = 0.512 MeV and
h
= 6.62 × 10
^{–34}
Js.
Answer
1
Akshit Chaturvedi
Subject: Physics
, asked on 28/2/18
While solving numericals how do we whether a radioactive decay is spontaneous or not?
Answer
1
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What are you looking for?

(1) $\frac{3}{16}$

(2) $\frac{13}{15}$

(3) $\frac{7}{15}$

(4) $\frac{5}{13}$

5. An alpha particle having kinetic energy of 10 MeV is moving towards a stationary nucleus of atomic number 50. The distance of closest approach will be.

(a) 1.44 x 10

^{-15}m (b) 1.44 x 10^{-15}m(c) 1.44 x 10

^{-13}m (d) 14.4 x 10^{-16}mQ.15. An ideal gas with adiabatic constant 5/3 is heated at constant pressure till its volume becomes double. Then the same gas is heated at constant volume till its pressure is doubled. The average value of C (molar heat capacity) for the complete process is

A) $\frac{9}{2}$ R

B) $\frac{13}{6}$ R

C) 3 R

D) $\frac{11}{6}$ R

Q.The time it will take a certain radioactive material with a half-life of 50 days to reduce to 1/32 of its original number isQ). Prove that sensitivity of a Galvanometer is maximum when deflection is 45$\xb0$.

Q73. Complete the following nuclear reactions

(i) ${}_{5}{}^{10}\mathrm{B}+{}_{0}{}^{1}\mathrm{n}\to {}_{2}{}^{4}\mathrm{He}+$.................

(ii) ${}_{42}{}^{94}\mathrm{Mo}+{}_{1}{}^{2}\mathrm{H}\to {}_{43}{}^{95}\mathrm{Te}+$................

$\left(A\right)1:2\phantom{\rule{0ex}{0ex}}\left(B\right)1:1\phantom{\rule{0ex}{0ex}}\left(C\right)1:4\phantom{\rule{0ex}{0ex}}\left(D\right)1:3$

^{6}watt, if the energy released per fission is 200 MeV?h= 6.62 × 10^{–34}Js.