Answer:

Explanation:
As we know that the frequency of the wave is given as

here we know that

also we know that

now we have


Repeat the experiment to make sure it gives the same results.
Hope i helped ; )
1. Centimeter
2. Kilogram
3. Millisecond
4. DL
5. Kg
6. Mm
7. S
8. Mm
9. Us
1.) Pitch
2.)Wavelength
3.)Density/Elastic Properties-b. Two of the above
4.)Liquids
5.) I'm not sure but I'm pretty sure it's the Doppler effect
6.) Frequency Increases
Are both intertwined. exercise and you will feel brand new!!!