General useful info Flashcards

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1
Q

What is a vacuum?

A

A volume that contains no matter

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2
Q

What is the gravitational field strength of the Earth and Moon?

A

Earth: 9.8N/kg

Moon: 1.6N/kg

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3
Q

What is the speed of sound?

A

330m/s

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4
Q

What is the speed of light?

A

300 million m/s (3 x 10^8)

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5
Q

What is the resolution of an instrument?

A

the smallest increment/change can be read from the equipment (e.g. if ruler measured in mm, the resolution would be 1mm)

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6
Q

How do you calculate uncertainty?

A

½ x range

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7
Q

What do you call the point where proportionality stops/levels off?

A

the limit of proportionality

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8
Q

What does it mean to move relative to?

A

One object will be stationary, the other will move around/in it i.e. relative to it

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9
Q

What is magnetic flux density?

A

A measure of the strength of the magnetic field

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10
Q

Why do scientists have different models like the wave and particle model of light?

A

different models may be appropriate in different situations

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11
Q

4 marks

Why do scientists replace an old scientific model with a new one? Give an example

A

new experimental evidence

evidence cannot be explained using an existing model

new model explains new evidence

e. g. nuclear model of the atom replacing the plum pudding model
* probably removed content*

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12
Q

How can you tell that two variables are in direct proportion from a graph?

A

The line is straight

and the line passes through the origin

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13
Q

What is thermal radiation?

A

Transfer of energy by waves

probably removed

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14
Q

When should a line graph be used?

A

When both variables are continuous

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15
Q

What is a zero error?

A

(measuring balance) displays reading when no object/mass is on it

(ammeter) displays reading when not connected

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