Fill in the blanks with appropriate items :
Symbol is needed to complete the nuclear equation `._(29)^(63)Cu (P, ....). _(29)^(62)Cu`
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Identify the following items are visible items or invisinble items: i) Exports of machines. ii) import of TV sets from Japan. iii) Banking services in
Visible items: i), (ii), (iv), Invisible itmes, (iii)
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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 (nuclear rad
Correct Answer - D Applying conservation of momentum, we get `m_(1) v_(1) = m_(2) v_(2) rArr (m_(1))/(m_(2)) = (v_(2))/(v_(1)) = (1)/(2)` Also, `R prop m^(1//3) rArr m prop R^(3)` `(m_(1))/(m_(2)) =...
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Fill in the blanks with appropriate items : The number of ` alpha` and `beta ` - particles emitted, when the following nuclear transformation takes pl
Correct Answer - 8,6 `._(92)^(238)X rarr. _(82)^(206)Y + x alpha + y alpha` `._(92)^(238)X rarr ._(82)^(206) Y + x(._(2)He^(4))+y(._(-1)^(0)e)` Comparing mass no. `238 rArr 206 + 4x +0y` `x=8 i.e. 8...
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Fill in the blanks with appropriate items : The half-life period of radioactive element _______ minute if 75% of it disintegrates in 40 min.
Correct Answer - 20 min. `t_(3//4)=2t_(1//2)=40 =2t_(1//2) rArr t_(1//2)=20 min`
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Fill in the blanks with appropriate items : When `._(c)^(a) X` changes to `._(d)^(b) Y` number if ` alpha` and `beta` particle emitted respectively ar
Correct Answer - `alpha=(a-b)/(4) ; beta = d+((a-b))/(2)-c` `._(c)^(a)M rarr ._(d)^(b)N+x(._(2)He^(4))+y(._(-1)e^(0))` `a=b+4x+0y` `(a-b)/(4)=x " " ..........(1)` `c=d+2x-y` `c-d-(a-b)/(2)=-y` `y=d+((a-b))/(2)=c`
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Fill in the blanks with appropriate items : The `alpha` -activity of `1 gm .^(226) Ra. (t_(1//2)=1620 ` year) is _______ dpm.
Correct Answer - `2.16 xx 10^(12) dpm` `A=N lambda =((1)/(226)xxN_(A)) xx(0.693)/(1620 xx12 xx24xx30xx60)` `2.16 xx 10^(-12)` d.p.m
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Fill in the blanks with appropriate items : The half life of the nuclide `Rn^(220)` is `54.5 sec`., _______ kg of radon is equivalent to 1 millicurie.
Correct Answer - `1.06 xx 10^(-15)` `A=Nlambda` ` 1xx10^(-3) xx3.7 xx10^(10)` d.p.s `=Nxx(0.693)/(54.5) " " ` 1curie`=3.7 xx 10^(10)` d.p.s. `N=290.98 xx10^(7) rArr (N)/(N_(A))=(29.98 xx10^(7))/(6.023 xx10^(23))=48.31 xx 10^(-16)` moles Mass of...
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Fill in the blanks with appropriate items : A radioactive substance decays 20% in 10 min if at start there are ` 5 xx 10^(20)` atoms present , after _
Correct Answer - `4.65` `k=(1)/(10) ln .(100)/(80) =(1)/(t) "in" (5xx10^(20))/(10^(18)) rArr (1)/(10)"in"(5)/(4)=(1)/(t) "in" 500 rArr (10 xx"in" 500)/("ln"(5)/(4))` `t=278.5` min. `t=4.641` hr.
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Fill in the blanks with appropriate items : This binding energies per nucleon for `._(1)H^(2) ` and `._(2)H^(4)` are ` 1.1MeV and 7.0 MeV` respectivel
Correct Answer - `23.6 MeV` `2 ._(1)H^(2) rarr ._(2)He^(4)` `Delta E=rArr(2+2)(7)-2(1+1)(1.1)` `rArr 23.6 ` MeV
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Fill in the blanks using appropriate word from the list at the end of each statement : `(i)` The magnitude of accleration of a particle in `S.H.M.` is
Correct Answer - `(i)` greatest `(ii)` potential energy, kinetic energy `(iii)` zero `(iv)` force costant and mass; amplitude, initial phase, and total energy `(vi)` maximum, minimum
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