Question

Q4. what is significant figures? Write rules
to identify significand figures.
find ignificand figures of the
following
(9) 2.070 (bl 0.03056 (C) 2.02 (d) 4.720 x 1012​

Answer 1

Answer:

each of the digits of a number that are used to express it to the required degree of accuracy, starting from the first non-zero digit are called significant figures

non-zero digits are significant: 1, 2, 3, 4, 5, 6, 7, 8, 9.

Zeros between non-zero digits are significant: 102, 2005, 50009.

Leading zeros are never significant: 0.02, 001.887, 0.000515.

In a number with or without a decimal point, trailing zeros (those to the right of the last non-zero digit) are significant provided they are justified by the precision of their derivation: 389,000; 2.02000; 5.400; 57.5400. More information through additional graphical symbols or explicit information on errors is needed to clarify the significance or importance of trailing zeros.

Explanation:

a)2.070 has 4 significant figures

b)0.03056 has 5 significant figures

c)2.02 has 3  significant figures

d)4.720 x 10^12​ has 4 significant figures