An organ pipe of length L that is open at one end resonates in ...

[tiara099]

An organ pipe of length L that is open at one end resonates in its third harmonic with a wavelength of 2L/3. Is the other end of the pipe closed or open?
 
  A) closed
  B) open
  C) We cannot tell from the information provided.

Question 2

A crying baby emits sound with an intensity of 8.0  10-8 W/m2. Calculate a reasonable estimate for the intensity level from a set of quintuplets (five babies),
 
  all crying simultaneously at the same place? The lowest detectable intensity is 1.0  10-12 W/m2.
  A) 79 dB
  B) 69 dB
  C) 56 dB
  D) 49 dB
  E) 36 dB

[scottmt]

Answer to Question 1

B

Answer to Question 2

C

[tiara099]

Gracias!

[ryansturges]

Excellent