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XII Physics > Nuclei > Flashcards

Nuclei Flashcards

1
Q

If radius of atom is 10^-10 then what is the radius of nucleus

A

10^-15

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2
Q

Find
Charge
Mass
Symbol
Of proton

A

Charge : +e
Mass : 1.6726×10^-27kg =1amu
Symbol : ¹H1

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3
Q

Find
Charge
Mass
Symbol
Of neutron

A

Charge : 0
Mass : 1.6749×10^-27kg = 1amu
Symbol : ¹n0

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4
Q

Atomic no. ?

A

No. Of proton

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5
Q

Mass number?
Is the mass number is the mass of atom?

A

Mass number = no.nucleons
Mass number is not the mass of atom

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6
Q

Mass of atom

A

No. Of nucleons × 1amu

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7
Q

Classification of nucleus

A

Isobar
Isotope
Isotone

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8
Q

What is isobar and give example

A

*same atomic number but different in mass number
*Protium
Deuterium
Tritium

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9
Q

What is isotope give example

A

Atomic number different
Mass number same
Eg: ⁴⁰A18
⁴⁰K19
⁴⁰Ca20

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10
Q

What is isotone and give example

A

Atomic no. Different
Mass no. Different
No. Neutrons same(A-Z)
¹⁴c6
¹⁶O8

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11
Q

Nuclear Radius

A

R=R⁰*A¹/³

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12
Q

Value Of R⁰

A

1.2fm

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13
Q

If 1amu÷4/3 π *R⁰^³ is Nuclear density what is the value

A

2×10^¹⁷kg/m³

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14
Q

For practical purpose Nuclear is in spherical shape is that true or false

A

True

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15
Q

Nuclear Force 4 properties

A

Attractive
Short range distance
Strongest force
Charge independent
(Fpp=Fpn=Fnn)

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16
Q

Einstein equation from special theory of relativity

A

E=mc²

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17
Q

What is mass defect

A

The loss of mass during the formation of nucleus

Mass of nucleus <mass of nucleon

18
Q

What is Binding energy

A

The energy for nucleons to stay in nucleus

19
Q

Binding Enegy equation if mass m is ∆m

A

E=∆mc²

20
Q

m/∆m equation?

A

[Zmass of proton + (A-Z)mass of neutron] - mass of X (element)

21
Q

If ∆m is in amu how to find Binding energy in Mev(mega ev)

A

Just multiply with 931

22
Q

Heavy Hydrogen 1.1Mev
Fe 469Mev
Uranium 1800 Mev
Which has more Nuclear stability

A

Fe have more stability

23
Q

Nuclear Stability is that based on B.E ?

A

No,its based on B.E/nucleon
Fe>Ur

24
Q

Lighter nucleus combined to form heavier nucleus is

A

Fussion

25
Q

Heavier nucleus divided to form stable nucleus is

A

Fission

26
Q

What is Radioactivity?

A

Attain stability naturally

27
Q

Name three process of Radioactivity

A

Alpha decay -using alpha
Beta decay-using ē
Gamma decay-using gamma

28
Q

Nuclear fission ? And its process

A

Split of heavier nucleus to lighter nucleus

*92 U²³⁵+0n¹»»92U²³⁶unstable
*U»>Ba+Kr+3(0n¹)+Energy
*U»>Nb+Sb+4(0n¹)+Energy
*U»>Xe+Sr+2(0n¹)+Energy

29
Q

Energy get from 1 Uranium is

A

216Mev

30
Q

Two type of chain nuclear Reaction

A

Uncontrolled Reaction
Controlled Reaction

31
Q

What’s happen in Uncontrolled Reaction

A

Energy increase without limit
Used in Atom bomb

32
Q

What’s happen in controlled Reaction

A

Energy is limited
Used in nuclear reactor

33
Q

Why nuclear fussion is practically impossible

A

For start it required to break atom bomb
Required high temperature

34
Q

Mainly nuclear fussion occur on?

A

Sun and star

35
Q

What are the name of following
ē
e+
(1-2)H
v

A

Electron
Positron
1H²
Neutrino

36
Q

First step of proton-proton cycle

A

(1-1)H + (1-1)H&raquo_space;>(1-2)H + e+
+ v + 0.42Mev

37
Q

Second step of proton proton cycle

A

e+ + ē&raquo_space;> √ + √ + 1.02Mev

38
Q

Third step of proton proton cycle

A

(1-2)H + (1-1)H&raquo_space;>(2-3)He + √ + 5.49Mev

39
Q

Fourth step of proton proton cycle

A

(2-3)He + (2-3)He&raquo_space; (2-4)He + (1-1)H + 12.86Mev

40
Q

Net reaction of proton proton cycle

A

4(1-1)H + 2ē&raquo_space; (2-4)He + 2v + 6√ + 26.7 Mev

XII Physics (2 decks)

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