IIT JEE-AIEEE 2012, Entrance Notifications, Study Tips, Engineering Preparation, Practice Test Papers, Experts Advice

Madmax

1)alpha particles are positively charged material particles (they are doubly ionised He atoms i.e. atoms with protons but no e- So a) is rite
2)Magic numbers are self explanatory ..They are simply Highly stable setups of protons or neutrons
For more read http://www.lbl.gov/abc/wallchart/chapters/06/1.html
3) is little lenghty I'll explain later!!
4)Neutral nature---e- and proton were discovered becos of their electrical properties but neutron can't be found out this way....Just think....How would you detect something as tiny as a neutron with such little mass without knowing any of its properties??
5)Electron neutrinos are generated whenever protons change into neutrons.These are the two forms of beta decay!!
6)By heart the Periodic table

I guess....No Idea Sorry!!
7)Simply K1+K2.....Coz it decays to one product with K1 and to second product at K2 So overall decaying is at K1+K2
Understand this and just put it into the Chemical kinetics rate eqn (Its a 1st order eqn )
8)I din't get the question!!
9)All isotopes are not radioactive but

particles are electrons so -ve So d)
10)Packing Fraction is the quotient of the algebraic difference between the isotopic mass and the mass number of a nuclide, divided by its mass number, often interpreted as a measure of stability.It is ratio between mass defect and mass number.Negative PF means isotopic mass is less than mass number.Here,some mass is transformed to energy as per E=mc^2.Therefore such nuclei are stable.
11) Is long ....i'll post later!!

Just one tip dude

Don't post such bunches of questions ....i think you'll get better answers if you post seperate posts!!

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