Question

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Answer 1

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