Question

Exercise 2.2
1. Express the following in standard form.
a) 0.000000067 b) 12.54.36.000
4. A calculator can perform a single
calculation in about 0.0000034 seconds.
How much time will it take to calculate
4,000 such calculations? Express your
answer in scientific notation.
d) 0.00028968
2. Express the following in usual form.
a 5.23 104
b) 2.05 - 103
d) 3.45 X 108
e) 2.49 * 1015
f) 8.99 x 10-7
5. Find the number of seconds in an hour, a
day, a week, a month and a year. Express
your answers in scientific notation.
c) 2x 105
3. One angstrom is the ten billionth part
of a metre. Express this information in
scientific notation.
6. One hectare is equal to 10,000 sq. m.
How much will this be in sq. cm? Express
your answer in scientific notation.​

Answer 1

1.a ) 6.8 × 10 to the power -8

b) don't know

4. 1 calculation =0.0000034

4,000 calculations = 0.0000034 × 4,000

= 0.0136

= 1.36 × 10 to the power -2

5) 1 hr = 60 × 60 = 3600 secs = 3.6 × 10 to the power 3

1 day = 86400 secs = 8.64 × 10 to the power 4

1 week = 604800 secs = 6.048 × 10 to the power 5

1 month = 2419200 secs = 2419200 secs

1 year = 29030400 secs

6. 1000000 sq. cm = 1 × 10 to the power 6