C because when the part gets out of the probe it would no longer stay contacted
I think it would be yes because the drum is submerged in water and the water would slow the sound waves, making the sound softer. Right?
Frequency = 1/time period = 1/0.05 = 20s^-1.
answer✿࿐
I was not able to write it here
so I did it somewhere else and attached the picture
i hope it helps
have a nice day
#Captainpower