Question

The size of the picture of a nanparticle is measured to be 5.2 cm by a ruler. If the scale bar size is 3 cm and is labeled 40 nm, find the actual size of the particle.

Answer 1

The actual size is

69.33 nm.

Step-by-step explanation:

It means that

3 cm is equivalent to 40 nm

So, 1 cm is equivalent to 40 / 3 nm

Thus, 5.2 cm is equivalent to

40 × 5.2 / 3 = 69.33 nm