A teacher wants to demonstrate that the speed of sound is not a constant value. Considering her regular classroom voice as the control, which of the following will increase the speed of sound leaving her mouth?  I. Submerge her mouth underwater and speak at the same volume.  II. Increase the temperature of the room and speak at the same volume.  III. Increase the pitch of her voice and speak at the same volume.  a. I only b. I and II only c. I, II and III d. II and III e. III only

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Q: Phy.3

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A: Answer: Option C is correct.  Correct explanation of this question is given below:

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