Final answer:
To find the number of atoms along a 45 cm line, we need to determine the number of atoms per cm and then multiply it by the length of the line.
Step-by-step explanation:
To find out how many atoms are there along a 45 cm line, we need to determine the number of atoms per cm and then multiply it by the length of the line. A typical atom has a diameter of about 1.0×10-10 m. So, the number of atoms per cm would be 1 cm divided by the diameter of an atom, which is approximately 1.0×10-10 m.
Number of atoms per cm = 1 cm / (1.0×10-10 m) = 1.0×1010 atoms/cm
Now we can multiply the number of atoms per cm by the length of the line to find the total number of atoms:
Total number of atoms = (1.0×1010 atoms/cm) × (45 cm) = 4.5×1011 atoms