pls answer fast. atleast solve one of them. need to be submitted in 15mins.

Question 1 (1 point)

Both ends of a hollow pipe are sealed and acoustic resonance is used to create a standing wave in the air column . If the pipe is 5 m long, what is the longest wavelength of standing waves that can be created?

Question 1 options:

a	5 m
b	20 m
c	10 m
d	15 m

Question 2 (1 point)

Three tuning forks are struck at the same time and beat frequencies of 5.0 Hz, 7.0 Hz and 12.0 Hz are heard. One of the tuning forks has a frequency of 225 Hz and another has a frequency of 232 Hz. What is the frequency of the third tuning fork?

Question 2 options:

a	237 Hz
b	220 Hz
c	239 Hz
d	more than one of the frequencies is possible

Question 4 (1 point)

A drum is struck creating a sound with an intensity of 6.20 x 10^-4 W/m^2 at a detector. A second quieter drum is then struck, creating a sound intensity level 4.95 dB lower than the first drum when placed the same distance from the detector. What is the sound intensity of the second drum at the detector? Express you answer answer to two decimal places in units of x10^-4 W/m^2, but do not include units in your answer.

Questions 5.

A speaker is producing spherically symmetric sounds with a total power of 63.1 W. The speaker is located at the centre of a sphere with a radius of 1.29 m. If a square detector at the edge of the sphere measures a power of 4.54 W, what is the total area of this detector?Give your answer in metres squared to 2 decimal places. Do NOT include units in your answer.