When an Organ Pipe,which Is Closed at One End Only,vibrates

Multiple Choice

When an organ pipe,which is closed at one end only,vibrates with a frequency that is three times its fundamental (first harmonic) frequency,

A) the sound produced travels at three times its former speed.
B) the sound produced is its fifth harmonic.
C) beats are produced.
D) the sound produced has one-third its former wavelength.
E) the closed end is a displacement antinode.