Question 1.27 Convert the following into basic units:
(i) 28.7 pm
(ii) 15.15 pm
(iii) 25365 mg
Class XI Some Basic Concepts of Chemistry Page 24
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concept : The basic unit for Length is metre,
for time is second and for mass is kilogram.
(i) 28.7 pm
we know,
1 pm = 10⁻¹² m
so, 28.7 pm = 28.7 × 10⁻¹² m = 2.87 × 10⁻¹¹ m
(ii) 15.15 μs
we know,
1 μs = 10⁻⁶ s
so, 15.15 μs = 15.15 × 10⁻⁶ m = 1.515 × 10⁻⁵ m
(iii) 25365 mg
we know,
1 mg = 10⁻⁶ kg
so, 25365 mg = 25365 × 10⁻⁶ kg
= 2.5365 × 10⁻² g
for time is second and for mass is kilogram.
(i) 28.7 pm
we know,
1 pm = 10⁻¹² m
so, 28.7 pm = 28.7 × 10⁻¹² m = 2.87 × 10⁻¹¹ m
(ii) 15.15 μs
we know,
1 μs = 10⁻⁶ s
so, 15.15 μs = 15.15 × 10⁻⁶ m = 1.515 × 10⁻⁵ m
(iii) 25365 mg
we know,
1 mg = 10⁻⁶ kg
so, 25365 mg = 25365 × 10⁻⁶ kg
= 2.5365 × 10⁻² g
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