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Answer:
11. 1 A° = 0.1 nm
5896 A° = 589.6 nm
The wavelength of a yellow line in spectrum of sodium atom is 586.9 nm.
12. 1 m³ = 1000000 cm³ = 10^6 cm³
13. (i) 1 kg/L = 1 g/ml
∴ 4.86 kg/L = 4.86 g/ml
(ii) 1 km = 1000 m
1 m = 100 cm
∴ 1 km = 100000 cm = 10^5 cm
∴ 1.86 km = 186000 cm
(iii) 6.92 x 10^-7 m = 0.000000692 m
1 m = 1000000 um = 10^6 um
∴ 0.000000692 m = 0.692 um
And
1 m = 10^9 nm
6.92 x 10^-7 x 10^9 = 6.92 x 100 = 692 nm
1 nm = 10 A°
692 nm = 6920 A°
(iv) 9.2 x 10^-3 cm³ = 0.0092 cm³
1 cm³ = 0.001 L = 10^-3 L
∴ 9.2 x 10^-3 cm³ = 9.2 x 10^-3 x 10^-3 = 9.2 x 10^-6 L
14. Capacity = Volume
From the given dimensions we can conclude that it is a cuboidal tank.
∴ Volume of a cuboid = l x b x h
∴ Volume of a cuboid = 0.8 m x 10 cm x 50 mm
It is necessary that the dimensions have the same units.
∴ Volume of a cuboid = 80 cm x 10 cm x 5 cm
∴ Volume of a cuboid = 4000 cm³
15. 1 L = 1000 cm³
100 L = 100000 cm³ = 10^5 cm³