A pipe of length 1 m is open at both ends. A standing wave of the fourth harmonic is set up within the pipe. What is the wavelength of the wave? Give your answer with a unit, and correct to one significant figure.

Ithink the answer would be a 

The fuzzy edges of shadows are a result of  diffraction 

Jenny and fred both play a long note on their trombones. a stationary observer hears the sound increasing and decreasing repeatedly in loudness. which of these must be true? the sound waves from the two trombones have slightly different frequencies.the sound waves from the two trombones have the same frequency.the sound waves from the two trombones have slightly different amplitudes.the sound waves from the two trombones have the same wavelength.the sound waves from the two trombones have slightly different velocities.  lolthe answer is          the sound waves from the two trombones have slightly different frequencies.