Exponents And Powers Worksheets - Class 8, National Council Of Educational Research And Training Page 19
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36U N I T - 8
Silver
1.79 × 10
–25
–26
Lithium
1.15 × 10
Hydrogen
1.674 × 10
–27
(a) Which is the heaviest element?
(b) Which element is lighter, Silver or Titanium?
(c) List all five elements in order from lightest to heaviest.
132. The planet Uranus is approximately 2,896,819,200,000 metres away
from the Sun. What is this distance in standard form?
133. An inch is approximately equal to 0.02543 metres. Write this distance
in standard form.
–7
134. The volume of the Earth is approximately 7.67 × 10
times the
volume of the Sun. Express this figure in usual form.
–31
135. An electron’s mass is approximately 9.1093826 × 10
kilograms.
What is this mass in grams?
136. At the end of the 20th century, the world population was
9
approximately 6.1 × 10
people. Express this population in usual
form. How would you say this number in words?
137. While studying her family’s history. Shikha discovers records of
ancestors 12 generations back. She wonders how many ancestors
she has had in the past 12 generations. She starts to make a diagram
to help her figure this out. The diagram soon becomes very complex.
Shikha
Parents,
Past (Generation 1)
Grandparents,
Past (Generation 2)
Great-grandparents,
Past (Generation 3)
(a) Make a table and a graph showing the number of ancestors in
each of the 12 generations.
(b) Write an equation for the number of ancestors in a given
generation n.
E E E E E
P P P P P
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XPONENTS
XPONENTS
AND
AND
OWERS
OWERS
XPONENTS
XPONENTS
XPONENTS AND
AND
AND
OWERS
OWERS
OWERS
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