Question

The return of sound after striking a surface is called_ of sound.​

Answer 1

Answer:

Explanation:

Indicators are substances whose solutions change color due to changes in pH. These are called acid-base indicators. They are usually weak acids or bases, but their conjugate base or acid forms have different colors due to differences in their absorption spectra.

Name Acid Color pH Range of Color Change

Litmus Red 5.0 - 8.0

Bromothymol blue Yellow 6.0 - 7.6

Thymol blue Yellow 8.0 - 9.6

Phenolphthalein Colorless 8.2 - 10.0

Answer 2

Answer:

reflection

Explanation:

The return of sound after striking a surface is called reflection of sound .

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