Frequence = ?
lambda = 0.5m
Vacocity = 340m/s
Talking about physic waves things.

Below

Explanation:

To find the frequency of a wave you can use this formula :

     f = v / λ

     f = 340m/s / 0.5m

     f = 680 Hz

Hope this helps!

dopamine..

"it was found that some people who were taking the drug l-dopa to raise their levels of dopamine were developing schizophrenic-like symptoms supporting research a strength of the dopamine hypothesis is that there are many studies which have shown support for the neurochemical explanation."

because growing process had stoped after 4-5 year