Did I Draw Longitudinal Waves Correctly for My Physics Exam?

[Zoheb Imran]

I just gave my Physics exam paper... and i want ask few questions and confirm if they are right...

Question asked to draw diagrams for longitudinal wave and transverse waves...
I drew transverse waves correctly... but did i correctly drew the longitudinal waves? i made a wave like transverse but with varying amplitude, frequency wavelength... so is it right?

Another question asked Students calculated the volume of air in a laboratory... with tables and windows and desks. How they did it?

I wrote: Use a Meter Rule to measure the volume of tables and desks. also measure the total volume of room. Subtract the Volume of tables and desks from total volume of room. You will get the volume of air.
State 2 errors while measuring.
1, I wrote: The students themselves occupies the volume
2, i forgot what i wrote , but what could it be?

Question A Ball is thrown "U" shaped large container It reaches to right top corner but little less in height, what would be the energy transfer? it was a mcq...
I wrote PE---> Kinetic energy +heat----> PE

 

[astrorob]

Sometimes it's best not to go searching for the answers after handing in an exam paper but if you still want to;

Question asked to draw diagrams for longitudinal wave and transverse waves...
I drew transverse waves correctly... but did i correctly drew the longitudinal waves? i made a wave like transverse but with varying amplitude, frequency wavelength... so is it right?

http://www.headwize.com/images2/e_simple1.gif

Another question asked Students calculated the volume of air in a laboratory... with tables and windows and desks. How they did it?

I wrote: Use a Meter Rule to measure the volume of tables and desks. also measure the total volume of room. Subtract the Volume of tables and desks from total volume of room. You will get the volume of air.
State 2 errors while measuring.
1, I wrote: The students themselves occupies the volume
2, i forgot what i wrote , but what could it be?

I'm thinking any number of rational answers. Maybe inherent errors in the measuring apparatus (equal to one unit) or the fact that you're treating the furniture as if it's cuboid as an approximation.