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tal goblet with four nodes and four antinodes

equally spaced around the 10:6 cm circumfer-

ence of its rim.

If transverse waves move around the glass

at 900 m=s, an opera singer would have to

produce a high harmonic with what frequency

in order to shatter the glass with a resonant

vibration? Answer in units of kHz.

I'm stuck on this problem, please help.