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(A)
2
BQR
Ans (C or B)
Sol e
B 2
R
t
E.2 R
B
t
R
E
2
B R
2 R. t
L t
m L
m
2
QBR
NARAYANA IIT/PMT ACADEMY
JEE ADVANCE : 2013
2
(B)
2
BQR
2
(PAPER – II) CODE: 0
(C)
2
BQR
2
2
Sign may be taken as +ve/-ve also depending upon direction of angular velocity
Paragraph for questions 15 and 16
(D)
2
BQR
The mass of a nucleus A X
Z
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 (m 1 + m 2 ) < M Also two light nuclei of masses m 3 and m 4 can undergo complete fusion
and form a heavy nucleus of mass M' only if (m 3 + m 4 ) > M' The masses of some neutral atoms are
given in the table below :
1
H 2
1007825 u H 3
2014102 u H 4
3016050 u He 4002603 u
1 1 1 2
6
Li 7
6015123 u Li 70
7016004 u Zn 82
69925325 u Se 81916709 u
3 3 30 34
152
Gd 206
151919803 u Pb 209
205974455 u Bi 210
208980388 u Po 209982876 u
64 82 83 84
15 The correct statement is
(A) The nucleus 6 Li
3
can emit an alpha particle
(B) The nucleus 210
Po
84
can emit a proton
(C) Deuteron and alpha particle can undergo complete fusion
(D) The nuclei 70
82
Zn
30
and Se
34
can undergo complete fusion
Ans (C)
Sol from data given only option C is correct
m m M '
3 4
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