Select Board & Class
A sample of radioactive element has a mass of 10g at an instant t=0. The approximate mass of this element in the sample after two mean lives is
1-1.35g
2-2.50g
3-3.70g
4-6.30g
A radioactive substance has 10^8 nuclei. Its half life is 30s. The no, of nuclei left after 15s is nearly
1-2x10^5
2-3x10^6
3-7x10^7
4-5x10^8
The power obtained in a reactor using U(235) disintegration is 1000 KW. The Mass decay of U(235) per Hour is
1- 1 microgram 2- 10 microgram
3-20 microgram 4- 40 micrgram
The decay constant of a radio isotope is lambda. If A1 and A2 are its activities at times t1 and t2 respectively, the no of nuclei which have decayed during the time (t1-t2)
1- A1t1-A2t2
2-A1-A2
3-(A1-A2)/lambda
4-lambda(A1-A2)
one second of clock means how many period of krypton and caesium clock ?how it is calculated?
Two radioactive substances A and B have decay constants 5(lambda) and lambda . At t=0 they have same no. of nuclei.The ratio of no.of nuclei of A to those of B will be (1/e)^2 after a time interval
1- 4/lambda
2-2/lambda
3-1/2(lambda)
4-1/4(lambda)
the decay constant for a given radioactive sample is 0.3465 day-1. What percentage of this sample will get decayed in a period of four days
The activity of a radioactive sample is measured as No counts per minute at t=0 and No/e counts per minute at t=5 minutes. The time (in minutes) at which the activity reduces to half its value is
1-5loge2 2-loge2/5
3-5/loge2 4-5log10(5)
The count rate of a geiger Muller counter for radiation of a radioactive material of half life of 30 minutes decreases to 5 /s after 2 hours. The initial count rate was.?
1-80/s 2-625/s
3-20/s 4-25/s
why does the binding energy per nucleon decreases with increase in mass no for heavy nuclei likeU238??PLY FST PLZZZZZZZZZZZZZZZZ
A nucleus ruptures into two nuclear parts, which have their velocity ratio equal to 2:1. What will be the ratio of their nuclear size?
1- 3^1/2:1
2-1:2^1/3
3-2^1/3:1
4-1:2^1/3
What is the mass of PROTON , ELECTRON and NEUTRON in atomic mass unit (amu) ?
Please solve the quesry as soon as possible .
Thank You .
The halif life of a given radioactive nuclide in 138.6 days. How much will a sample of tis radioactive nuclide gets reduced to only 12.5% of its initial value?
Half life of a radioactive elements is 10 days. The time during which quantity remains 1/10 of initial mass will be
What should be the antiproton, which is the antiparticle of proton ?
which of the following radiations ALPHA, BETA, GAMA rays correspond toI)similar to X-rays2) easily absorbed by matter3)similar in nature to cathode raysplz rply fast
deduce the formula of average life for a radioactive nuclei.
If a beam consisting of α,β,γ radiations is passed through an electric field perpendicular to the beam , the deflections suffered by the components , in decreasing order , are
a. α,β,γ
b. α,γ,β
c. β,α,γ
d. β,γ,α
Please explain briefly
In a radio active material the activity at time t1 is R1 and at a later time t2 is R2. If the decay constant of the material is (lambda) then,
1-R1=R2
2-R1=R2e^(-lambda)(t1-t2)
3-R1=R2e^(lambda)(t1-t2)
4-R1=R2(t2/t1)
is nuclear force conservative in nature ? explain how
2- a meson of negligible vel decays to muon and a neutrino find the KE that the muon move
3- a nucleus of mass M+deltam is at rest and decays into 2 daughter nuclei of equal massM/2 EACH find speed of daughter
nuclei and B.E /nucleon for parents- e1 for daughter nuclei e2 find relation b/w e1 and e2
u think that if i told u that due to paucity of money i m unable to paid u then what happens to u
Method for finding cube-root when no. is like A 1/3 ?
Why is electron preferred over nucleons for probing nuclear structure?
A) electrons do not experience strong nuclear force
B) electrons will have higher energy than their initial energy on striking the nucleus
C) electrons will radiate energy while coming close to the nucleus
D) the impact parameter of electrons will be less than the radius of the nucleus.
Justify your answer.
why binding energy release if fission
Please explain the reaction occuring in the sun
its a urgent plz answer my ques fast faculty i m unable to solve this plz hlp me as soon as possible
1-at t=o a sample is placed in a reactor an unstable nuclide is produced at a const rate R in the sample by neutron absorption the nuclide beta- decays with half life tau find the time reqd to produce 80% of the equilibrium quantity of this unstable nuclide
3- a nucleus of mass M+deltam is at rest and decays into 2 daughter nuclei of equal massM/2 EACH find speed of daughter nuclei and B.E /nucleon for parents- e1 for daughter nuclei e2 find relation b/w e1 and e2
"Exothermic chemical reactions underlie conventional energy sources such as coal or petroleum".
Explain.
E.g: 9876543210, 01112345678
We will give you a call shortly, Thank You
Office hours: 9:00 am to 9:00 pm IST (7 days a week)
Syllabus
A sample of radioactive element has a mass of 10g at an instant t=0. The approximate mass of this element in the sample after two mean lives is
1-1.35g
2-2.50g
3-3.70g
4-6.30g
a) alpha particle b) neutron c) electron d) proton
A radioactive substance has 10^8 nuclei. Its half life is 30s. The no, of nuclei left after 15s is nearly
1-2x10^5
2-3x10^6
3-7x10^7
4-5x10^8
The power obtained in a reactor using U(235) disintegration is 1000 KW. The Mass decay of U(235) per Hour is
1- 1 microgram 2- 10 microgram
3-20 microgram 4- 40 micrgram
The decay constant of a radio isotope is lambda. If A1 and A2 are its activities at times t1 and t2 respectively, the no of nuclei which have decayed during the time (t1-t2)
1- A1t1-A2t2
2-A1-A2
3-(A1-A2)/lambda
4-lambda(A1-A2)
one second of clock means how many period of krypton and caesium clock ?how it is calculated?
Two radioactive substances A and B have decay constants 5(lambda) and lambda . At t=0 they have same no. of nuclei.The ratio of no.of nuclei of A to those of B will be (1/e)^2 after a time interval
1- 4/lambda
2-2/lambda
3-1/2(lambda)
4-1/4(lambda)
the decay constant for a given radioactive sample is 0.3465 day-1. What percentage of this sample will get decayed in a period of four days
The activity of a radioactive sample is measured as No counts per minute at t=0 and No/e counts per minute at t=5 minutes. The time (in minutes) at which the activity reduces to half its value is
1-5loge2 2-loge2/5
3-5/loge2 4-5log10(5)
1.Isomer of parent.
2.Isotone of parent.
3.Isotope of parent.
4.Isobar of parent.
The count rate of a geiger Muller counter for radiation of a radioactive material of half life of 30 minutes decreases to 5 /s after 2 hours. The initial count rate was.?
1-80/s 2-625/s
3-20/s 4-25/s
why does the binding energy per nucleon decreases with increase in mass no for heavy nuclei likeU238??PLY FST PLZZZZZZZZZZZZZZZZ
A nucleus ruptures into two nuclear parts, which have their velocity ratio equal to 2:1. What will be the ratio of their nuclear size?
1- 3^1/2:1
2-1:2^1/3
3-2^1/3:1
4-1:2^1/3
What is the mass of PROTON , ELECTRON and NEUTRON in atomic mass unit (amu) ?
Please solve the quesry as soon as possible .
Thank You .
The halif life of a given radioactive nuclide in 138.6 days. How much will a sample of tis radioactive nuclide gets reduced to only 12.5% of its initial value?
(i) normal person A having total volume V of blood in the body
(ii) person B in need of blood transfusion having a volume 𝑉′ of blood in the body.
The number of radioactive atoms per unit volume in the blood streams of the two persons after a time nT are found to be N1 and N2.
Prove mathematically that the additional volume of blood that needs to be transfused in the body of person B equals
Please help as soon as possible .
Thank you .
1H2+ 1H3 ---> 2He4 + n
given that the repulsive potential energy between the two nuclei is 7.7 x 10-14J, the temp. at which the gases must be heated to initiate the reaction is?
Half life of a radioactive elements is 10 days. The time during which quantity remains 1/10 of initial mass will be
What should be the antiproton, which is the antiparticle of proton ?
which of the following radiations ALPHA, BETA, GAMA rays correspond toI)similar to X-rays2) easily absorbed by matter3)similar in nature to cathode raysplz rply fast
deduce the formula of average life for a radioactive nuclei.
If a beam consisting of α,β,γ radiations is passed through an electric field perpendicular to the beam , the deflections suffered by the components , in decreasing order , are
a. α,β,γ
b. α,γ,β
c. β,α,γ
d. β,γ,α
Please explain briefly
In a radio active material the activity at time t1 is R1 and at a later time t2 is R2. If the decay constant of the material is (lambda) then,
1-R1=R2
2-R1=R2e^(-lambda)(t1-t2)
3-R1=R2e^(lambda)(t1-t2)
4-R1=R2(t2/t1)
is nuclear force conservative in nature ? explain how
2- a meson of negligible vel decays to muon and a neutrino find the KE that the muon move
3- a nucleus of mass M+deltam is at rest and decays into 2 daughter nuclei of equal massM/2 EACH find speed of daughter
nuclei and B.E /nucleon for parents- e1 for daughter nuclei e2 find relation b/w e1 and e2
u think that if i told u that due to paucity of money i m unable to paid u then what happens to u
Method for finding cube-root when no. is like A 1/3 ?
Why is electron preferred over nucleons for probing nuclear structure?
A) electrons do not experience strong nuclear force
B) electrons will have higher energy than their initial energy on striking the nucleus
C) electrons will radiate energy while coming close to the nucleus
D) the impact parameter of electrons will be less than the radius of the nucleus.
Justify your answer.
why binding energy release if fission
Please explain the reaction occuring in the sun
its a urgent plz answer my ques fast faculty i m unable to solve this plz hlp me as soon as possible
1-at t=o a sample is placed in a reactor an unstable nuclide is produced at a const rate R in the sample by neutron absorption the nuclide beta- decays with half life tau find the time reqd to produce 80% of the equilibrium quantity of this unstable nuclide
2- a meson of negligible vel decays to muon and a neutrino find the KE that the muon move
3- a nucleus of mass M+deltam is at rest and decays into 2 daughter nuclei of equal massM/2 EACH find speed of daughter nuclei and B.E /nucleon for parents- e1 for daughter nuclei e2 find relation b/w e1 and e2
R → P + α; λR = 4.5 × 10–3 years–1
S → P + β; λS = 3 × 10–3 years–1Starting with number of atoms of R and S in the ratio of 2 : 1, this ratio after the lapse of three half lives of R will be : Options 1. 3 : 2 2. 1 : 3 3. 1 : 1 4. 2 : 1
Please help as soon as possible.
Thank you.
"Exothermic chemical reactions underlie conventional energy sources such as coal or petroleum".
Explain.