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Physics > Radioactivity > Flashcards

Radioactivity Flashcards

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1
Q

What did JJ Thompson discover?

A

Plum Pudding Model

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2
Q

Who did the gold foil experiment

A

Ernest Rutherford

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3
Q

What did James Chadwick discover

A

Neutrons are in the nucleus

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4
Q

What did Bohr theorise

A

Electrons or I tied the nucleus in shells

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5
Q

What stops alpha

A

Skin or paper e.t.c they are the least penetrating

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6
Q

Which is the biggest radioactive particle

A

Alpha

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7
Q

What is Beta?

A

A fast moving electron

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8
Q

What’s Gamma stopped by

A

Thick lead and thick concrete

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9
Q

What does Gamma move in?

A

Waves

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10
Q

What is half life

A

Time taken for the number of radioactive nuclei in an isotope to halve

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11
Q

What is an alpha particle made of

A

Two protons and two neutrons. Atomic number decreases by 2 and Mass number decreases by 4

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12
Q

What happens in Beta decay

A

The proton number increases by 1

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13
Q

Why don’t we put Alpha particles inside the body

A

It is highly ionising and able to cause a lot of damage it also finds it hard to penetrate the skin.

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14
Q

Why don’t we out beta particles inside the body?

A

Some of the radiation is able to escape

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15
Q

Why do we put Gamma into the body?

A

It’s the least ionising and the safest of the three to put in.

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16
Q

What is radioactive decay measured in?

A

Becquerels ( Bq )

17
Q

Is radioactivity decay predictable?

A

No its a random process

18
Q

Where does radioactive substances give their radiation out from?

A

The nucleus

19
Q

When does irritation occur

A

When materials are near a radioactive source.

20
Q

What’s the plum pudding model?

A

The atom is a ball of positive charge with electrons scattered within it

21
Q

What’s an isotope

A

An element with the same number of protons but a different number of neutrons

22
Q

What stops Beta?

A

Aluminium

23
Q

Which is the most penetrating out of alpha beta and gamma?

A

Gamma

24
Q

Why do some isotopes give out radiation

A

They are unstable and as a result decay

Physics (2 decks)

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