# Thread: Express the following physical quantities using prefix notation and numbers? HomeWork

1. ## Express the following physical quantities using prefix notation and numbers? HomeWork

Express the following physical quantities using prefix notation and numbers between 1 and 999?

.........-5
4.8 x10 V
.........-7
6.3 x 10 W
..........4
8.2 x 10 N
.........-10
1.6 x 10 A
..........10
3.3 x 10 Hz
..........-7
5.6 x 10 m

2. $4.8\times 10^{-3} V = 4.8 mV$

$10^{9} = \text{giga (G)}$
$10^{6} = \text{mega (M)}$
$10^{3} = \text{kilo (k)}$
$10^{-3} = \text{milli (m)}$
$10^{-6} = \text{micro}\ (\mu)$
$10^{-9} = \text{nano (n)}$

Try the others now and post what you get!

3. ## Thanks

0.63 uW

820 KN

16 nA

33 nHZ

56 un

Is that right?

4. Notice that the example I posted bears the power of -3 and not -5 in your question, okay?

0.63 uW is not good. It's below 1. You need to take the next smallest prefix, that is nano: 630 nW

820 kN is not good either. You made a calculation error somewhere. It should be 82 kN

16 nA is not good. It should be in fact 0.16 nA, which means we need the next smallest prefix, which is the pico )p), giving 160 pA

33 nHz? The power you posted is 10, and not -10. Is that a typo? If it's power 10, the it becomes 33 GHz

56 um is not good. It's in fact 560 nm.

Hm... let me give you this tip.

Let's take a number: $3.5 \times 10^{-5}A$

Separate it to the one just below -5, which is -6.

$3.5 \times 10^{1} \times 10^{-6}A = 3.5 \times 10 \times 10^{-6} A= 35 \mu A$

$6.3 \times 10^{-7}A$

Take -9, which is below -7.

$6.3 \times 10^{-7}A =6.3 \times 10^{2}\times 10^{-9}A = 630 nA$

5. Thanks, I get it now.

Many Thanks Andy054