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Physics Paper 1 > P7 - Radioactivity > Flashcards

P7 - Radioactivity Flashcards

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1
Q

What is the acronym for remembering the chemists who made discoveries about the model of the atom?

A

Don’t - Dalton
Try - Thompson
Remembering - Rutherford
Brilliant - Bohr
Chemists - Chadwick

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2
Q

What are helium nuclei?

A

Alpha particles

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3
Q

What is alpha radiation?

A

When an alpha particle is emitted from the nucleus

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4
Q

What is an alpha particle made of?

A

Two neutrons and two protons

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5
Q

What is alpha radiation absorbed by?

A

A sheet of paper (doesn’t penetrate very far into materials)

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6
Q

What is alpha radiations ionising power? Why?

A

High due to their size

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7
Q

What is a beta particle/radiation?

A

A high speed electron

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8
Q

What’s the charge of an alpha particle?

A

+2

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9
Q

What’s the charge of a beta particle?

A

-1

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10
Q

How ionising is a beta particle?

A

Medium/moderately ionising

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11
Q

What is an alpha particles range in air?

A

Around 5cm

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12
Q

What is a beta particles range in air?

A

A few metres

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13
Q

What is a gamma particles range in air?

A

Infinite

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14
Q

What are beta particles absorbed by?

A

Thin aluminium (they penetrate moderately far into materials before colliding)

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15
Q

What is a gamma particle?

A

Waves of electromagnetic radiation released by the nucleus

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16
Q

What is a gamma particles ionising power? Why?

A

Low - they tend to pass through rather than collide with atoms

17
Q

What are gamma particles absorbed by?

A

Thick lead or metres of concrete (they penetrate far into materials without being stopped)

Physics Paper 1 (7 decks)

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