physics waves and sound question please

Question

My question is at the bottom of the procedure. I've solved for everything else. Here's the procedure for the lab:

 

1. Hold one end of a meter (yard) stick down on a tabletop so that 20 cm of the stick extends past the edge of the table. Pluck the end of the stick extending past the edge of the table to produce a vibration and sound. Observe this vibration and sound and record your observations.
2. Repeat the step above, but this time double (to 40 cm) the length of the stick that extends from the table.
3. Repeat this step again, allowing the meter stick to extend 60 cm from the edge of the table.
4. Take the cardboard tube and make a kazoo by cutting a hole in the middle of the tube. Make the hole approximately 1 cm in diameter. Use a rubber band to secure a piece of wax paper over one end of the cardboard tube.
5. Make another kazoo following the same instructions as above, but cut the cardboard tube 10 cm shorter than the first tube.
6. Hum into each of your kazoos created above. Try to make the humming noise as consistent as possible in each tube. Observe and record how the length of the kazoo affects the pitch of the sound produced.
7. Cut the neck off the balloon. Replace the wax paper on the longer kazoo with the cut balloon, wrapping the rubber band around the end of the cardboard tube. The rubber band should hold the tightly stretched balloon over the end of the tube. Use tape to attach the small mirror to the balloon at the end of the tube.
8. Get a helper to shine a flashlight on the mirror while you hum into the kazoo. The helper should position the flashlight so a spot of light is reflected on the wall (you may have to darken the room). Observe how the light moves as you hum into the kazoo. Note your position and the position and angle of both the kazoo and the flashlight.
9. Raise the pitch of your humming while keeping the loudness the same. Observe how the spot of light differs from the step above. Keep the distance from the wall and the angle at which the light from the flashlight strikes the kazoo the same.
10. Repeat the above step while humming at a lower pitch.
11. Repeat the above two steps, but this time vary the loudness while keeping the pitch constant.

 

 

Explain why you do not need to know the original sound intensity.

 

Thank you

Answer 1

That sounds like THE question the lab is supposed to lead you to?

Shouldn't you use your lab data to explain that?

Think ratios.