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Labonyo Sen from Calcutta Girls High School, KOLKATA
Subject :NSO    Class : Class 8

When sound wave travels from air into water, how do the frequency, wavelength and speed changes?

Frequency Wavelength Speed
A No change Decreases Decreases
B Increases No change Decreases
C No change Increases Increases
D Increase No change Increase


Ans 1:

Gaurish Singla from DPS School Sector 19, Faridabad
Class : Class 8

Ans 2:

Shreyam Tripathy from Ann Mary School, Dehradun
Class : Class 10
answer is A since speed of sound in air is more than that in water

Ans 3:

Prerona Chatterjee from DPS North Kolkata, Kolkata
Class : Class 9
Speed of light in water is less as compared to that of air as water is optically denser than air.

Ans 4:

Aditya Anmol from Delhi Public School Ruby Park Kolkata, Kolkata
Class : Class 8
The answer should be A but it is showing C

Ans 5:

Shreyans Mondal from GD Goenka Public School Dakshineswar, Kolkata
Class : Class 8
Yes its A

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