a. Solid to liquid - melting process
b. Liquid to gas - evaporation process
c. Gas to solid - deposition process
d. Solid to gas - sublimation process
e. Liquid to solid - solidification process
f. Gas to liquid - condensation process
The frequency will decrease because the waves are getting farther and farther apart and if they and as that happens with shorter and shorter so they decrease
To try to get attention, it's not safe and you can get sent to the hospital. People think it's a joke, it's really not.