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Radioactivity > Radioactivity > Flashcards

Radioactivity Flashcards

1
Q

3 main particles of an atom

A

Electron ,Proton, Neutron

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2
Q

Electrons have_______ orbits

A

Stationary

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3
Q

No.of shells in an atom depends on

A

Total number of electrons in it

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4
Q

What is the centre of an atom

A

nucleus

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5
Q

At.no of an atom is equal to the

A

Protons in its nucleus

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6
Q

Mass number of an atom is equal to the?

A

total no of nucleons

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7
Q

Atoms of the same element having same atomic number but different mass number

A

Isotopes

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8
Q

Isoptopes have same______ but different________

A

atomic number,mass number

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9
Q

____ has the largest number of isotopes

A

Tin

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10
Q

Atom of different element have same mass no but different atomic number

A

Isobars

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11
Q

Isobars are_____element having______mass number but ___________atomic number

A

different,same,different

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12
Q

What are mirror isobars?

A

If the no of protons and neutrons get interchanged then, they are called mirror isobars

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13
Q

Atoms having different no of protons but same neutrons

A

isotones

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14
Q

Positive charged particles

A

alpha

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15
Q

-ve charged particles

A

beta

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16
Q

uncharged particles

A

gamma

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17
Q

Radioactive elements

A

the substances which decay by the spontaneous emission of radiation

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18
Q

Natural radioactive substances

A

When the number of neutrons is much more than the number of protons

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19
Q

Radioactivity is a __________phenomenon

A

Nuclear

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20
Q

Radioactive decay is a __________phenomenon

A

random

21
Q

beta particles deviate ______than alpha particles

A

more

22
Q

Mass of an apha particle is roughly

A

4 times the mass of proton

23
Q

Speed of alpha particle

A

10^7 ms-1

24
Q

Alpha particles _____________ a photographic plate

A

Affect

25
Q

Speed of beta particle

A

10^8 ms-1

26
Q

Betta particles____________ a photographic plate

A

Affect

27
Q

Speed of gamma particles

A

same as speed of light i.e 3*10^8 m s-1

28
Q

Gamma radations have___________ionising power but_______penetrating power

A

least, maximum

29
Q

Alpha radations have___________ionising power but_______penetrating power

A

maximum, least

30
Q

1 a.m.u=

A

931MeV

31
Q

What is nuclear fission?

A

The process in which a heavy nuclei is split into two smaller nuclei of nearly the same size,when bombared with slow neutrons.

32
Q

Nuclear bomb is based on what kind of a chained reaction?

A

Uncontrolled

33
Q

2 use of fission

A

1) Destructive-nuclear bomb
2) Constructive-electric power

34
Q

Nuclear fission ____ be control

A

can

35
Q

Necular fusion

A

2 light nuclei combine to form a heavy nuclie

36
Q

Nuclear fusion is not possible under what temperature and pressure?

A

Ordinary

37
Q

What is the fusion reaction also called as?

A

thermo-nuclear reaction.

38
Q

Nuclear fission reaction is possible at what temperature and pressure

A

ordinary

39
Q

1 fission reaction________ energy is released

A

190MeV

40
Q

1 fusion reaction ____________ energy is released

A

24.7MeV

41
Q

The fissionable substance is

A

radioactive

42
Q

Fission process can be________

A

Controlled

43
Q

Nuclear bomb is based on_______-

A

Uncontrollable fission reaction

44
Q

Hydrogen bomb is based on

A

Uncontrollable fusion reaction

45
Q

Uncontrollable fission reaction give what kind of a bomb?

A

Nuclear

46
Q

Uncontrollable fusion reaction give what kind of a bomb?

A

Hydrogen

47
Q

What is the simailarty in fission and fusion

A

Release of energy dur to loss in mass.

48
Q

In each fission reaction the_____ remains conserved

A

mass and atomic number

49
Q

Moderators in nuclear reactor

A

Graphite and Heavy water

Radioactivity (4 decks)

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