Question

The density of gold is 19 g/cm³. If 1.9 × 10⁻⁴ g of gold is
dispersed in one litre of water to give a sol having spherical
gold particles of radius 10 nm, then the number of gold
particles per mm3 of the sol will be :
(a) 1.9 × 10¹² (b) 6.3 × 10¹⁴
(c) 6.3 × 10¹⁰ (d) 2.4 × 10⁶

Answer 1

Answer:

a long, sturdy piece of squared timber or metal used to support the roof or floor of a building.

"there are very fine oak beams in the oldest part of the house"

Answer 2

Answer:

2.4×10raised to 6

mark me as brainliest

Explanation:

hope it helps