Answer pls pls pls pls

3.15*10 to the power of 24

Explanation:

Using the formula we get wavelength = velocity/frequency. substituting  the values gives us option B

acid rain does not usually kill trees directly. instead, it is more likely to weaken the trees by damaging their leaves, limiting the nutrients available to them, or poisoning them with toxic substances slowly released from the soil. the main atmospheric pollutants that affect trees are nitrates and sulphates.

c, liquids evaporate, creating a gas