All
BE/B.Tech
MBA/PGDM
MBBS
ME/M.Tech
B.Sc
BA
B.Com
BCA
BBA/BMS
B.Sc (Nursing)

Ranking

College ranked based on real data

Indiatoday - 1740
Collegedunia - 1406
IIRF - 1684
Outlook - 1318
NIRF - 1301
Top Ranked Colleges in India ›

Find Colleges

Discover 19000+ colleges via preferences

Best MBA colleges in India
Best BTech colleges in India
Discover Top Colleges in India ›

Compare Colleges

Compare on the basis of rank, fees, etc.

IIT Madras vs IIT Delhi
IIT Madras vs IIT Bombay
Compare Colleges ›

Exams

Know more about your exams

B.Com
B.Sc
B.Sc (Nursing)
BA
BBA/BMS
BCA
BE/B.Tech
Check All Entrance Exams in India ›

College Predictor

Know your college admission chances

JEE Main
JEE Advanced
CAT
NEET
GATE
NMAT
MAT
XAT
Find Where you may get Admission ›

Course Finder

Discover top courses in Indian Colleges 2025

BE/B.Tech - 963
MBA/PGDM - 1159
ME/M.Tech - 1221
B.Sc - 1052
Get Top Courses in Indian Colleges ›

Your Gateway to Top Colleges & Exams

Discover thousands of questions, past papers, college details and all exam insights – in one place.

Popular Colleges

Top Exams

JEE MainJEE Main
JEE AdvJEE Advanced
NEET UGNEET UG
BITSATBITSAT
COMEDKCOMEDK
VITEEEVITEEE
WBJEEWBJEE

Paragraph: The mass of a nucleus \({ }_{Z}^{A} X\) is less than the...

Paragraph:

The mass of a nucleus \({ }_{Z}^{A} X\) is less than the sum of the masses of \((A-Z)\) number of neutrons and \(Z\) number of protons in the nucleus. The energy equivalent to the corresponding mass difference is known as the binding energy of the nucleus. A heavy nucleus of mass \(M\) can break into two light nuclei of masses \(m_{1}\) and \(m_{2}\) only if \(\left(m_{1}+m_{2}\right) \lt M\). Also two light nuclei of masses \(m_{3}\) and \(m_{4}\) can undergo complete fusion and form a heavy nucleus of mass \(M^{\prime}\) only if \(\left(m_{3}+m_{4}\right) \gt M^{\prime}\). The masses of some neutral atoms are given in the table below:




\(\left(1 u=932 M e V / c^{2}\right)\)


Question:

The correct statement is
The nucelus 3 6 Li can emit an alpha particle.
The nucleus 84 210 Po can emit a proton.
Deuteron and alpha particle can undergo complete fusion.
The nuclei 30 70 Zn and 34 82 Se can undergo complete fusion.
Solution:
(A)   3 Li 7 2 He 4 + 1 H 3
Δ m = M Li - M He - M H 3
= 6.01513 - 4.002603 - 3.016050
= - 1.003523 u
Δ m  is negative so reaction n is not possible.
(B)   84 Po 210 83 Bi 209 + 1 P 1
Δ m  is negative so reaction is not possible.
(C)   1 H 2 2 He 4 + 3 Li 6
Δ m  is positive so reaction is possible.
(D)   30 Zn 70 + 34 Se 82 64 Gd 152
Δ m  is positive so reaction is not possible.