Sound question 1)Approximately what fundamental frequency (in Hz) would you expe

Question

Sound question
1)Approximately what fundamental frequency (in Hz) would you expect to hear as a result of blowing across the top of an empty 30cm high bottle?

Mirrors and Lenses questions
1) For a diverging lens in air with one flat surface, the radius of curvature for the curved surface is 20.0cm. what must the index of refraction be so that the focal length is -15.0cm?
is that 1.33?

2)An ant viewed through a converging lens produces a virtual image that is 5 times the size of the ant. If the ant is 6.0cm from the lens, what is the focal length of the lens?

Explanation / Answer

please ask one question per post as per Cramster policy. sound question 1) For open end pipe the fundamental frequency is f = v / 4 L Length is L = 30 cm f = 20 m/s / 4* 30 *10^-2 m = 16.6 Hz

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