Question

"nucleus is sometimes exited to higher state following the emission of alpha or beta particle, the excited stte of the nucleus is unstable
in coming back to its ground state from excited state, gamma radiations are emitted"

what do these lines mean?

Answer 1

does it mean gamma rays are only emmited when alpha or beta are emited from nucles?

Answer 2

there's no other way of emmision of gamma rays from nucleus of radioactive element?

Answer 3

@aaronq ? can u help please

Answer 4

I have no idea, sorry. My nuclear chem is weak

Answer 5

its ok :)

Answer 6

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Answer 7

i hope tagging wil not annoy..but if it does..wm sorry

Answer 8

it means when ever alpha or beta particle emitted fromm nucles it give a +ve or -ve charge to nucles depend upon the emitted particle..and at that time the nucleus is not in stable state mean excited state that it can not exist in that state for so longer..and then emmision of gemma rays turn it to in stable state or so...!!!

Answer 9

@zaibali.qasmi kan ider se pekro ya ooder se aik he bat hoti hy

Answer 10

g...!!!nhi..in physics its wrong..

Answer 11

sorry. can't help with that.

Answer 12

ecited state esi state hoti hai k nuclues apni stable halt me nhi hota mean k us wqt zra se enegry dny py nucles ko tora ja skta hai..

Answer 13

When a nucleus has enough extra energy which can occur with a collision (inelastic scattering)or absorption of another particle i.e. a neutron, proton, deutero, etc. It will decay according to the amount of extra energy that it has and various selection rules ie. spin, parity, angular momentum what ever that is not forbidden by the rules. Higher energy particle are for likely because they can excape the Coulomb barrier more easily. To emit a particle you must have enough extra energy to provide for the formation of the particles mass and extra energy to help the particle escape.

So for an arbitrary excited nucleus if enough energy is available alpha particles neutrons, proton, beta particles or gamma rays may be emitted. But which ones depends on a complex scheme of rules that forbid certain types of decays. the rules also determine the probablity of decay by varioius means.

Answer 14

@zaibali.qasmidoes it mean gamma rays are only emmited when alpha or beta are emited from nucles?i got it what are u saying dear ...
but
there's no other way of emmision of gamma rays from nucleus of radioactive element?
i wana know this mentioned below my question

Answer 15

@triciaal its ok dear thnku

Answer 16

@gleem
its quite helpful :)
can u clear it please:-

there's no other way of emmision of gamma rays from nucleus of radioactive element?
i wana know this mentioned below my question

Answer 17

All of the events like alpha and beta emmission, as well as things like fission, fusion, neutron absorbtion, and a few others, can leave the nucleus in an excited state. When it comes back down to ground state, a photon is emitted with an energy that corresponds to the energy level transition of the step that just occurred. This is a gamma ray.

Answer 18

so what you conclude from this ..??? @saroash

Answer 19

hmmm :) getting it

Answer 20

i concluded u hav working brain :D not me :P

Answer 21

ok 1 thing more... @zaibali.qasmi

Answer 22

no...its wrong concept..that i have and don't you...although alpha beta have charges and gemma don't but still it have energy.! :P :P :P :P i think you are gettin it..

Answer 23

yes ...whats that..?

Answer 24

gamma rays are are electromagnetic...there emission causes no change in charge or mass of nucleus... so can they cause radioactive decay?

Answer 25

yup u hav hv dowain ..brain v energy v :P
esi khali energy dau malak :P

Answer 26

hahahah.... good @saroash samjhdar hen...

Answer 27

nxxt step??

Answer 28

radio active deccay is always occur in those nuclies which are unstable ...and any nuclus get unstable by alpha and beta but not gammaa....so whats your conclusion..???

keep in mind if gamma rays emmited then law of conservation of mass and charge holds good but not momentum..and gemma produces radio activity when it is added with an alpha or beta not alone...

Answer 29

hmm getting it :)

Answer 30

ummmmmmmmmmmmmm

Answer 31

Radioactive material of sufficiently long half life to be accumulated in the lab decay with the emission of either alpha or beta mostly but neutron emission is possible. This decays is usually followed by gamma decay with the possibility of more alpha, beta decay until there is not enough excess energy to form the particles.

Answer 32

y law of momentum wil not?? @zaibali.qasmi

Answer 33

neutron emmision @gleem i never read it ...i m not getting it :(

Answer 34

cos nucles has zero spin...but gamma emmited have half integral spin and this fact is correctd by injucting a new factor or you can say particle like photon which has no mass and charge but only momentum that is called nutrino...which has -ve half spin momentum ...and this balnces the equatin so far..!!!

Answer 35

Uranium 235 spontaneously emits neutrons.

Answer 36

not only 235 all isotopes of uranium and most are emmitted by U238

Answer 37

i got it...... yippppppiiiiiiiiiiiiiiiiiiiiiii :D

Answer 38

hey thankoooooooooooo both ... i wish i cd give medal to both of u :(
wel thanks alot @gleem thanks :)

Answer 39

Photons have spin 1

Answer 40

Also momentum is conserved in decay. This law was invoke to explain the continuous distribution of energy in Beta decay and led to the discovery of the neutrino.

Answer 41

ok got it :)