In the resonance column experiment, why do we use water ? Can we use any other liquid ?

Why do we group data?

In a resonance column experiment , the first resonance is obtained when the level of the water in the tube is at 20 cm from the open end . Resonance will also be obtained when the water level is at a distance of

"In a resonance column experiment, when the length of the air column is increased by changing the water level sound heard becomes louder." Why?

Why can't we see air ?

How do we see objects around us?

Why do we see a rainbow in the sky only after rainfall?

In Young's double -slit experiment, why do we use mono chromatic light ? If while light is used, how would the pattern change ?

Why do we use cooking utensils made up of copper ?

A student performed the experiment to measure the speed of sound in air using resonance air-column method. Two resonances in the air-column were obtained by lowering the water level. The resonance with the shorter air-column is the first resonance and that with the longer air-column is the second resonance. Then,

Why do we require sweetening agents ?