The `alpha`-decay of nucleus `X^(230)` is accompanied by emission of two groups of `alpha-`particles-one group having `alpha-`particles of kinetic energy 6.7MeV and other having `alpha`-particles of kinetic energy 5.2 MeV. Following the emission of these particles the daugheter muclei are found in ground and exiceted states. find the energy of gamma photon. that is subsequenctly emitted by de-exictation of the excited daughter nuclei. Assume that nuclei of `X^(230)` are at rest.
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Classify the following compounds as primary, secondary and tertiary halides. (i) 1-bromobut-2-ene (ii). 4-Bromopent-2-ene (iii). 2-Bromo-2-methylpropa
(i) `underset(("primary"))(CH_(3)-CH=CH-CH_(2)-Br)` (ii). `underset(("Secondary"))(CH_(3)-underset(Br)underset(|)(C)H-CH=CH-CH_(3))` (iii). `underset(("Tertiary"))(CH_(3))-underset(CH_(3))underset(|)overset(Br)overset(|)(C)-CH_(3)`.
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If a variable takes the discrete values `alpha-4`, `alpha -(7)/(2), alpha-(5)/(2), alpha-2,alpha+(1)/(2), alpha-(1)/(2), alpha+5(alpha gt 0)`, then th
Correct Answer - A Arrange the data as follows : `alpha-(7)/(2), alpha-3, alpha-(5)/(2),alpha-2, alpha-(1)/(2),alpha+(1)/(2),alpha+4,alpha+5` Median `=(1)/(2)` [value of 4th item+value of 5th item] `therefore " Median"=(alpha-2+alpha-(1)/(2))/(2)=(2alpha-(5)/(2))/(2)=alpha-(5)/(4)`
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An `alpha`-particle having kinetic energy x MeV falls on a Cu-foil. The shortest distance from the nucleus of Cu to which `alpha`-particle reaches is
Correct Answer - 5 `K.E.=(KZe.2e)/(r ), " "K.E.=(9xx10^(9)xx29xx2(1.6 xx 10^(-19))^(2))/(1.67xx10^(-14))=5Mev`
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A radioactive nucleus decays by emitting one alpha and two beta particles, the daughter nucleus is ….. Of the parent.
Correct Answer - isotope
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An element `_(z)M^(A)` undergoes an `alpha -` emission followed by two successive `beta- emission.` The element formed is ……
Correct Answer - `zM^(A-4) `
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A radioactive nucleus A decay to C after emitting two `alpha` and three `beta` particles. Another nucleus B decays to C by emitting one `alpha` and fi
Correct Answer - (a) `Z_(A)-Z_(B)=4;A_(A)-A_(B)=4` (b) `(9N_(0))/(2)` (c) 6 hr
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Suppose a nucleus initally at rest undergoes `alpha` decay according to equation `._(92)^(225)X rarr Y +alpha` At `t=0`, the emitted `alpha`-particles
Correct Answer - `[(a) ((q_(alpha)E_(0))/m_(alpha)t)i+v_(0) cos theta hat(j)-v_(0) sin theta hat(k)` where `theta=omegat` and `omega=(q_(alpha)B)/m_(alpha)`, (b) `10^(7) m//s` (c) `8.00 MeV]`
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An alpha particles kinetic energy `T= 5.3 MeV` initiates a nuclear reaction `Be^(9)(alpha,n)C^(12)` with energy yield `Q=+5.7MeV`. Find the kinetic en
Correct Answer - `[T_(n) = (Q + (1 -m_(a)//m_(c))T)/(1 + m_(n)//m_(c)) = 8.5 MeV]`
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Potassium-40 can decay in three modes .It can decay by `beta^(-)` - emission,`beta^(+)` -emission or electron capature. (a) Write the equation showing
Correct Answer - [(a) `._(19)^(40)K rarr ._(20)^(40)Ca + e^(-) + bar(v), ._(19)^(40)K rarr ._(18)^(40)Ar + e^(+) +v, ._(19)^(40)K + e^(-1) rarr ._(18)^(40)Ar+v` (b) 1.3034 MeV, 0.4676 MeV, 1.490 MeV]
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And `alpha`-particle with kinetic enregy `T_(alpha) = 7.0 MEV` is scattered elastically by an initially stationary `.^(6)Li` nucleus. Find the kinetic
Correct Answer - `[(T)/([1+(M-m)^(2)//4mM cos^(2) theta]) = 6.0 MeV]`
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