<span>Phase, color, and ductility are all examples of physical external properties</span>
Answer:
The ratio of the diameter of iron to Cu is;

Explanation:
R=(ρL)/A
- R is resistance,
- L is length,
- A is area,
- ρ is resistivity
- d is diameter
from the question the two materials have the same resistance per unit length.

for iron =
for copper
This means we can equate ρ/A for both materials.

re-arranging the equation we have,





Answer:
wallah i don't understand anything with my stoopid brain
Explanation:
Answer: Temperature and humidity are the two characteristics used to classify air masses.
Explanation: