Nucleii

Question 1

The α- particle is a

Answer 1

Helium nucleus

Question 2

The source of energy in the sun is

Answer 2

nuclear fusion

Question 3

The energy equivalent to 1 gm of substance is

Answer 3

9 x 10 ^13 J

Question 4

In the controlled chain reaction the fast moving neutrons are slowed down by using moderator, these neutrons are called

Answer 4

Thermal neutrons

Question 5

In the process of ____ the lighter nuclei together make a heavy nucleus

Answer 5

Fusion

Question 6

In the range of mass no. A = 30 to A = 170 the value of _______ is nearly constant

Answer 6

Per nucleon binding energy

Question 7

i) Radius of nucleus
ii) Mass Defect
iii)Unit of energy
iv) Neutron
v) Proton
vi) 1 a.m.u

Answer 7

R = R0 x A^1/3
Δm = [Z(mp + me) + (A – Z)mn] – matom
electron volt
Chadwick
Rutherford
931 MeV

Question 8

Nuclear fusion is not possible in laboratory, Why ?

Answer 8

for nuclear fusion very high temp. 10^7k and high pressure is required and its not possible in laboratory

Question 9

Which part of the electromagnetic spectrum has highest penetrating power

Answer 9

Y-rays

Question 10

What is the order of the size of a nucleus

Answer 10

10^ -15 m