A sound tone is produced in water, when it enters air -----
a) λ decreases & f remains same
b) both λ & f increases
c) both λ & f decreases
d) λ increases & f does not change
 

Dear Student
When a sound tone is produce in water and it enters in air its wavelength(lambda) increase but frequency(f) does not change.
So option (D) is the correct answer



Regards