One of the causes of polarity is the unequal forces of the dipole forces due to differences in electronegativity. The more electronegative molecule tend to attract electrons, hence the polarity arrows point towards it. The electronegativity of Phosphorus and Fluorine is 2.19 and 3.98, respectively. Thus, it points outward towards the fluorine atoms.
Answer:
Electromagnetic waves can travel through empty space; mechanical waves can not
Explanation:
The salient differences between electromagnetic waves and mechanical waves is that electromagnetic waves can travel through empty spaces but mechanical waves cannot.
Mechanical waves always requires a material medium for their propagation. No known mechanical waves can pass through an empty vacuum.
Electromagnetic waves on the other hand can pass through vacuum. They do not require a material medium for propagation.
This makes them unlimited in their form and mode of propagation.
Answer: The Wind Fluctuates. Wind energy has a similar drawback to solar energy in that it is not constant. Wind Turbines Are Expensive. Although costs are reducing, wind turbines are still very expensive.
Reno, nevada since it stays constantly higher than barrow alaska
