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Physics Paper 1 > Radiation > Flashcards

Radiation Flashcards

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1
Q

What is Alpha radiation ?

A

helium nucleus
2protons, 2neutrons

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2
Q

What is the mass and charge of Alpha radiation ?

A

4 relative mass
+2 relative charge

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3
Q

What is Beta radiation ?

A

A high velocity electron

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4
Q

What is the mass and charge of Beta radiation ?

A

0 relative mass
-1 relative charge

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5
Q

What is gamma radiation ?

A

A wave of electromagnetism

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6
Q

What is the charge and mass of gamma radiation ?

A

0 relative charge
0 relative mass

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7
Q

What is the charge and mass of gamma radiation ?

A

0 relative charge
0 relative mass

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8
Q

What is one use of alpha radiation ?

A

Smoke alarms

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9
Q

What is one use of beta radiation ?

A

testing paper thickness

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10
Q

What is one use of gamma radiation ?

A

to be used as a medical tracer
(put into body and creates an image of the body for medical tests)

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11
Q

What can alpha penetrate ?

A

A few centimetres of air

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12
Q

What can beta penetrate ?

A

A few centimetres of air
A few millimetres of paper

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13
Q

What can gamma penetrate ?

A

A few centimetres of air
A few millimetres of paper
A few millimetres of aliminium

Stopped by Thick lead

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14
Q

What is the ascending order of strength in radiation ?

A

Alpha
Beta
Gamma

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15
Q

What is the ascending order of ionisation in radiation ?

A

Gamma
Beta
Alpha

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16
Q

Why is gamma least ionising ?

A

1 photon interacts with 1 electron
so each gamma photon can only ionise 1 atom and only if it actually hits an electron

17
Q

Why is alpha more ionising than beta ?

A

Alpha is slower (more time to interact)
Much bigger (bigger space to interact)
x2 charge

18
Q

What are some sources of radiation ?

A

rocks
fallout from nuclear testing
radiation from chenauble

19
Q

How is background radiation accounted for in an experiment ?

A

count background radiation for ~10 minutes
deduct from final count

20
Q

What is the unit for activity ?

A

Number of decays per second
Bq
s^-1

21
Q

What is the unit for Intensity ?

A

Activity per unit area
Bq m^-2
s^-1 m^-2

Physics Paper 1 (6 decks)

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