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Science Year 9 > Physics > Flashcards

Physics Flashcards

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1
Q

What is Specific heat capacity?

A

The amount of energy needed to change 1kg of a substance by 1 degrees celcius

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2
Q

What is Alpha radiation?

A

Helium nucleus with 2 protons and 2 neutrons

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3
Q

What is Beta radiation?

A

Fast moving electron

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4
Q

What is Gamma radiation?

A

High energy electromagnetic wave

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5
Q

What particle has a negative charge?

A

Electron

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6
Q

What particle has a positive charge?

A

Proton

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7
Q

How does an electron move to a higher energy level?

A

Emitting electromagnetic radiation

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8
Q

How does an electron move to a lower energy level?

A

Absorbing electromagnetic radiation

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9
Q

Who discovered the plum pudding model?

A

JJ Thomson

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10
Q

Who discovered the nucleus?

A

Rutherford

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11
Q

The first person to come up with the idea of the atom?

A

Democritus

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12
Q

Who discovered electron shells?

A

Bohr

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13
Q

Who discovered neutrons?

A

Chadwick

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14
Q

An atom that gains or loses an electron?

A

Ion

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15
Q

Why does a neutral atom has no overall charge?

A

Because protons and electrons have an equal opposite charge.

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16
Q

What is an Isotope?

A

Atoms of the same element with different numbers of neutrons

17
Q

What is radioactive decay?

A

the emission of energy in the form of ionizing radiation

18
Q

What are the particles in the nucleus of an atom?

A

Protons and Neutrons

19
Q

What is Half Life?

A

The time it takes for half of the unstable nuclei to decay

20
Q

Where is the majority of an atoms mass?

A

In the Nucleus

21
Q

What is the size of the radius of the atom?

A

1 x 10^-10 metres

22
Q

What are good conductors of heat?

A

Metals

23
Q

What are poor conductors of heat?

A

Non-metals and gases

24
Q

Name some types of energy?

A

Kinetic energy, heat energy, light energy

25
Q

What are the main uses of energy?

A

Transport, Generating electricity, Heating

26
Q

Renewable energy source?

A

Wind Power, Solar Power, Hyrdoelectric Power

27
Q

Non-renewable energy source?

A

Coal, Gas, Oil

Science Year 9 (3 decks)

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