"Question 3 Express the number appearing in the following statements in standard form. (i) 1 micron is equal to m. (ii) Charge of an electron is 0.000, 000, 000, 000, 000, 000, 16 coulomb. (iii) Size of a bacteria is 0.0000005 m (iv) Size of a plant cell is 0.00001275 m (v) Thickness of a thick paper is 0.07 mm
Class 8 Exponents and Powers Page 200"
Answers
A number expressed in the form of k × 10ⁿ, where k is a terminating decimal such that 1 ≤ k <10 and n is any Integer , is said to be in scientific notation or standard form of notation.
In standard exponential notation, the number is always written with only one digit to the left of the decimal.
If the decimal point moves to the left or the number is large, add the number of places the decimal move to the current exponent of ten.
If the decimal point moves to the right or the number is small, subtract the number of places the decimal moves from the current exponent of ten.
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Solution:
(i) 1 micron is equal to 1/1000000 m.
1/1000000
=1×10^-6
(ii) Charge of an electron is 0.000, 000, 000, 000,
000, 000, 16 coulomb.
0.000, 000, 000, 000, 000, 000, 16
=1.6 ×10^-19
(iii) Size of bacteria is 0.0000005 m
=0.0000005
=5 ×10^-7
(iv) Size of a plant cell is 0.00001275 m
= 0.00001275
=1.275 ×10^-5
(v) Thickness of a thick paper is 0.07 mm
=0.07
=7×10^-2
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Hope this will help you.....
Answer:
Step-by-step explanation:
Solution:
(i) 1 micron is equal to 1/1000000 m.
1/1000000
=1×10^-6
(ii) Charge of an electron is 0.000, 000, 000, 000,
000, 000, 16 coulomb.
0.000, 000, 000, 000, 000, 000, 16
=1.6 ×10^-19
(iii) Size of bacteria is 0.0000005 m
=0.0000005
=5 ×10^-7
(iv) Size of a plant cell is 0.00001275 m
= 0.00001275
=1.275 ×10^-5
(v) Thickness of a thick paper is 0.07 mm
=0.07
=7×10^-2