1. Working as a physicist Flashcards

1
Q

What are 4 base SI quantities?

A

Mass (Kg)
Length (m)
Time (s)
Current (A)
Temperature (K)
Amount of substance (mol)
Luminous intensity (cd)

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2
Q

What is the standard form and symbol of tera?

A

10^12 T

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3
Q

What is the standard form and symbol of giga?

A

10^9 G

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4
Q

What is the standard form and symbol of mega?

A

10^6 M

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5
Q

What is the standard form and symbol of kilo?

A

10^3 k

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6
Q

What is the standard form and symbol of centi?

A

10^-2 c

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7
Q

What is the standard form and symbol of milli

A

10^-3 m

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8
Q

What is the standard form and symbol of micro?

A

10^-6 μ

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9
Q

What is the standard form and symbol of nano?

A

10^-9

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10
Q

What is the standard form and symbol of pico?

A

10^-12

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11
Q

What is the standard form and symbol of femto?

A

10^-15

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12
Q

Name three ways to reduce random errors.

A

Take 3 repeats and calculate a mean.
Use computers to reduce human error.
Use correct equipment to reduce uncertainty due to resultion of equipment.

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13
Q

Name three ways to reduce systematic error. (hint: rad, measuring vol,dist)

A

Calibrate apparatus by measuring a known value.
Correct for background radiation.
Read at eye level to reduce parallax error.

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14
Q

Define systematic errors.

A

An error having a non-zero mean, so that its effect is not reduced when observations are averaged

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15
Q

Define random errors.

A

An error in measurement caused by factors which vary from one measurement to another.

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16
Q

Contrast absolute uncertainty and percentage uncertainty.

A

Absolute uncertainty is given as a fixed quantity whereas percentage uncertainty is a percentage of the measurement.

17
Q

How could you reduce percentage uncertainty?

A

Measure larger quantities