Scientists often make measurements. These need to be stated with the units of the quantity being measured, and the accuracy of the measurements.
Which is NOT an SI base unit?
Why is hertz a derived unit?
It is equivalent to seconds
Frequency is calculated from 1 ÷ time
The abbreviation is Hz
Which of these is a derived unit?
Coulomb, the unit for electric charge
Kilogram, the unit for mass
Metre, the unit for distance
What is the abbreviation for the unit for power?
What is the value of 26 GW?
What is equivalent to 0.015 µm?
1.5 × 10-8 m
1.5 × 10-4 m
1.5 × 10-6 m
How many seconds are there in one day?
How many significant figures are quoted in 12,000 J?
What is 345,678 to three significant figures?
Why is 0.000630 stated as being three significant figures?
The leading zeros are ignored
The trailing zeros are ignored
The leading zeros are ignored but the trailing zero counts