sound help please?

Question

which one of the following frequencies of A wave in the air can be heard as an audible sound by the human ear?a,0.10Hz,,b,,10Hz,,c,,1000Hz,,d,,100,000Hz


which one of the following phenomena is taking place when sound waves are reflected from a surface along parallel lines? a,diffusion,,b,,absorption,,c,,refractiing,,d,,focusing

a wave with a period of 0.008 second has a frequency of? a,,12.5Hz,,b,,80Hz,,c,,125Hz,,d,,800Hz

the answers for the q's got cut off..

question 1 d is 100,000

question 2 c is refracting and d is focusing

question 3 d is 800 hz

Answer 1

You haven't listed all the answers; besides, I'm not doing your homework for you! If there's something you don't understand, then I'll explain it to the best of my ability, but I won't give you the answers -- that's cheating, not learning!

Read the chapter, I'm sure the frequency range of human hearing, how sound waves travel, and how to calculate cycles per second are all in there.

Answer 2

for ur first qn, its C, 1000Hz because the audible frequnecy range is between 20 to 20000 Hz