Two tuning forks have frequencies of 440 and 522 Hz. What is the ...

[armygirl]

Two tuning forks have frequencies of 440 and 522 Hz. What is the beat frequency if both are sounding simultaneously?
 
  A) 962 Hz
  B) 481 Hz
  C) 82 Hz
  D) 55 Hz
  E) 41 Hz

Question 2

A pipe of length L that is closed at one end and open at the other end is resonating at its fundamental frequency. Which statement about the sound is correct?
 
  A) The wavelength is 4L and there is a displacement node at the pipe's open end.
  B) The wavelength is 4L and there is a displacement antinode at the pipe's open end.
  C) The wavelength is L and there is a displacement node at the pipe's open end.
  D) The wavelength is L and there is a displacement antinode at the pipe's open end.

[gasdhashg]

Answer to Question 1

C

Answer to Question 2

B