Prefixes

How many Joules are in 5 kilojoules?

• 50 J

• 500 J

• 5000 J

• 50000 J

Answer explanation

To convert kilojoules to joules, multiply by 1000. Therefore, 5 kilojoules equals 5 x 1000 = 5000 joules. The correct answer is 5000 J.

What power of 10 represents the "Mega" prefix?

• 10^3

• 10^6

• 10^9

• 10^12

Answer explanation

The "Mega" prefix represents a factor of 10^6, which means one million. Therefore, the correct answer is 10^6.

What power of 10 represents the "nano" prefix?

• 10^-3

• 10^-6

• 10^-9

• 10^-12

Answer explanation

The prefix 'nano' represents one billionth, which is equivalent to 10^-9. Therefore, the correct answer is 10^-9.

What is the standard form equivalent of the prefix 'pico'?

• 10^-9

• 10^-12

• 10^-6

• 10^-3

Answer explanation

The prefix 'pico' represents one trillionth, which is equivalent to 10^-12. Therefore, the correct answer is 10^-12.

How is a frequency of 5.3 GHz expressed in standard form in Hertz (Hz)?

• 5.3 x 10^6 Hz

• 5.3 x 10^9 Hz

• 5.3 x 10^12 Hz

• 5.3 x 10^-9 Hz

Answer explanation

5.3 GHz is equivalent to 5.3 x 10^9 Hz, as 1 GHz equals 10^9 Hz. Therefore, the correct expression in standard form is 5.3 x 10^9 Hz.

How is 720 nanometers (nm) correctly expressed in standard form in meters (m)?

• 720 x 10^-9 m

• 7.20 x 10^-7 m

• 7.20 x 10^-9 m

• 72.0 x 10^-8 m

Answer explanation

720 nm is equal to 720 x 10^-9 m. To express this in standard form, we convert it to 7.20 x 10^-7 m, which is the correct scientific notation. Thus, the correct answer is 7.20 x 10^-7 m.

Which prefix corresponds to a factor of 10³?

• kilo

• giga

• mega

• centi

How is 4.5 millimeters (mm) written in standard form in meters (m)?

• 4.5 x 10^-3 m

• 4.5 x 10^-2 m

• 4.5 x 10^-9 m

• 4.5 x 10^-6 m

What is the standard form equivalent of the prefix 'micro'?

• 10^-6

• 10^-3

• 10^-9

• 10^-12