A radioactive element ${X} _{90}^{238}$ decays into ${Y} _{83}^{222}$. The number of $\beta$-particles emitted are

The mass number of an element in a radioactive series is 223. Then the radioactive series is ................

A radio isotope X has a half life of $10s$. Find the number of active nuclei in the sample (if initally there are $1000$ isotopes which are falling from rest from a height of $3000m$) when it is at a height of $1000m$ from the reference plane: 

When a $\beta^-$ particle is emitted from a nucleus, the neutron-proton ratio:

A certain mass of an ideal diatomic gas contained in a closed vessel is heated. It is observed that half the amount of gets dissociated, but the temperature remains constant. The ratio of the heat supplied to the gas to the initial internal energy of the gas will be

A positron is emitted by radioactive nucleus of proton number $90$. The product nucleus will have proton number :

When $ _{15}P^{30}$ decays to become  $ _{14}Si^{30}$, which particle is released ?

A nucleus $ _{  }^{ 220 }{ X }$ at rest decays emitting an $\alpha$- particle. If energy of daughter nucleus is $0.2MeV$, $Q$ value of the reaction is

The antiparticle of electron is

Which decay increases the atomic number?

What would be an atom that has lost an electron?

For which of the following events will the resulting products have more mass than the mass of the stuff from which the products came?

The equation $ _{88}Ra^{226}\rightarrow _{86}Rn^{222}+ _{2}He^{4}$ emits which particle?

During $\beta^-$ emission:

Nuclei of a radioactive element $A$ are being produced at a constant rate $\alpha$. The element has a decay constant $\lambda$. At $t =0$, there are $N _{0}$ nuclei of the element.
If $\alpha = 2N _{0}\lambda$, calculate the number of nuclei of $A$ after one half life of $A$, and also the limiting value of $N$ as $t\rightarrow \infty$.

$90$% of a radioactive sample is left undecayed after time $t$ has elapsed. What percentage of the intial sample will decay in a total time $2t$:

$ _{84}P _{0}^{210}$ originally at rest emits $\alpha $- particles of KE 'K' Find  the KE of recoiling nucleus:

When a radioactive nucleus emits a $\beta $- particular, the proton- neutron ratio

A free neutron is unstable against $\beta$ decay with a half life of about $600$ seconds:

Initial number of nuclei of a radioactive substance is $5 \times 10 ^ { 16 }$ and half-life is $10$ yrs. Find the number of nuclei decayed in $5$ yrs.

A mixture consists of two radioactive materials ${ A } _{ 1 }$ and ${ A } _{ 2 }$ with half lives of 20 s and 10 s respectively. Initially the mixture has $40 g$ of ${ A } _{ 1 }$ and $160 g$ of ${ A } _{ 2 }$. The active amount of the two in the mixture will become equal after :

Samples of two radioactive nuclides $A$ and $B$ are taken. $\lambda _ { A }$ and $\lambda _ { B }$ are the disintegration constants of $A$ and $B$ respectively. In which of the following cases, the two samples can simultaneously have the same decay rate at any time ? 

The radius of spherical nucleus as measured by electron scattering is 36. fm. what is the likely mass number of the nucleus?

A radioactive element $ _ { 90 } \mathrm { X } ^ { 238 }$ decays into $\mathrm { 83 } \mathrm { Y } ^ { 222 }$,then the number of $\beta$ -particles emitted are

A bone containing 200 g carbon-14 has a $\beta $ decay rate of 375 deacy/min. Calculate the time that has elapsed since the death of the living one. Given the rate of decay for the living organism is equal to 15 decay per min per gram of carbon and half - life of carbon -14 is 5730 years,

A nucleus X undergoes following transformation
$x \stackrel { a } { \longrightarrow } Y$
$Y \longrightarrow Z$

From the following the wrong statement is:

When $ _{3}Li^{7}$ nuclei are bombarded by protons, and the resultant nuclei are $ _{4}Be^{8}$ , the emitted particles will be.   

$ {27}^{57}\textrm{Co}$ will emit __________ radiation

Which of the following assertions are correct?

If $ _{5}\textrm{B}^{11}$ converts into $ _{6}\textrm{C}^{11}$, then the particle emitted in this process will be 

What does a neutron decays to?

The particle emitted in the nuclear reaction 
$ _{z}\textrm{X}^{A}$ = $ _{z+1}\textrm{Y}^{A}$ + ..... will be 

The nucleus of mass  $M +  \Delta m$  is at rest and decays into two daughter nuclei of equal mass  $\dfrac {  M  } { 2 }$  each. Speed of light is  $ c.$ The speed of daughter nuclei is

The particle $X$ in the following nuclear reaction is  $ _{7}^{13}\textrm{N}$ $\longrightarrow $ $ _{6}^{13}\textrm{C}+$  $ _{1}^{0}\textrm{e}$ + $X$

A radioactive material initially contains $10gm$ and after few days $3gm$ is left, then the emission rate of $\alpha$ or $\beta$ particle:-

The ionization potential for second He electron is 

Which word equation represents $\beta^+$ decay?

A radioactive substance contains a number of identical nuclei that emit $\beta$- particles. Which property of these nuclei remains unaltered by emission?

In $\beta^-$ decay, a

The number of $\beta$-particles, if a radioactive element $ _{90}X^{238}$ decays into $ _{83}Y^{222}$ is :

Which of the following nuclei is produced when a $ _{92}U^{238}$ nucleus undergoes a $(d, 2n)$ reaction followed by a beta decay?

In which of the following processes, the number of protons in the nucleus increase?

Atomic masses of two isobars $ _{29}^{63}Cu$ and $ _{30}^{64}Zn$ are $63.9298 u$ and $63.9292 u$, respectively. It can be concluded from this data that

The electron emitted in beta radiation originates from

Masses of two isobars $ _{29}Cu^{64}$ and $ _{30}Zn^{64}$ are $63.9298\ u$ and $63.9292\ u$, respectively. It can be conclude from these data that

Neutron decay in free space is given as follows
$ _{ 0 }{ n }^{ 1 }\longrightarrow _{ 1 }{ H }^{ 1 }+ _{ 1 }{ e }^{ 0 }+$[  ]
Then the parenthesis [  ] represents a

The number of neutrons in the element L in the following nuclear changes is 
$^{238} _{92}M\, \rightarrow\, ^x _y\, N\, +\, ^4 _2\, He$
$^X _YN\, \rightarrow\, ^A _BL\, +\, 2\beta^+$

$^{11} _{6}C\, \rightarrow\,  ^{11} _{5}B$ decay produces -

In radioactive decay process, the emitted negatively charged $\beta$ - particles are :

Which of the following statement is correct?

Find out the missing particle in the following nuclear reaction?
$^2 _1H+^{63} _{29}Cu \rightarrow ^{64} _{30}Zn+(?)$

The number of neutrons decreases by 1 after radioactive decay. Identify the type of decay.

Compared to the parent nucleus, the daughter nucleus of a $\beta$ decay has:

When carbon $-14$ undergoes beta (electron) decay, it transmutes into what?

Find out the product of a $Co^{60}$ atom that undergoes one beta plus decays?

In $\beta$ decay.

When an atom undergoes $\beta$-decay, its atomic number

10 grams of $^{57}Co$ kept in an open container beta-decays with a half-life of $270$ days. The weight of the material inside the container after $540$ days will be very nearly.

During a $\beta ^-$ decay which of the following statements are correct?

Masses of neutron, proton and electron are $1.0087$U, $1.0073$u and $0.0005$u respectively. If a neutron decays into a proton and an electron, the energy released would be about.

During $\beta-decay$ (beta minus), the emission of antineutrino particle is supported by which of the following statement(s)?

A positron is emitted from $\mathrm{N}\mathrm{a} _{11}^{23}$. The ratio of the atomic mass and atomic number of the resulting nuclide is

$ _{6}^{11}\textrm{C}$ on decay produces 

Masses of two isobars $ _{29}^{64}\textrm{Cu}$ and $ _{30}^{64}\textrm{Zn}$ are $63.9298 amu$ and $63.9292 amu$ respectively. It can be concluded from these data that 

A nucleus of magnesium decays into a nucleus of sodium by emitting a $\beta^{+}$ particle. The decay is
represented by the equation shown.
$^{23} _{12}Mg \rightarrow ^{P} _{Q}Na + ^{0} _{+1}\beta$
What are the values of $P$ and $Q$?