What is the frequency of Jon's clapping?

Question

Rosa and Jon were asked by their physical

science teacher to determine the speed of

sound. While walking to their dormitories af-

ter class, Jon clapped his hands, which Rosa

and Jon heard a moment later as an echo. The

echo bounced o® a building that was 250 ft

away. They knew that they could not mea-

sure the brief time for a single clap to return,

so they had a brillant idea. Jon clapped and

then started to clap as soon as he heard the

echo, and he then continued this synchronized

clapping so that Rosa could measure the fre-

quency. Rosa counted 71 of Jon's claps in one

half minute.

What is the frequency of Jon's clapping?

Answer in units of Hz.

Rosa and Jon were asked by their physical

science teacher to determine the speed of

sound. While walking to their dormitories af-

ter class, Jon clapped his hands, which Rosa

and Jon heard a moment later as an echo. The

echo bounced o® a building that was 250 ft

away. They knew that they could not mea-

sure the brief time for a single clap to return,

so they had a brillant idea. Jon clapped and

then started to clap as soon as he heard the

echo, and he then continued this synchronized

clapping so that Rosa could measure the fre-

quency. Rosa counted 71 of Jon's claps in one

half minute.

1. What is the frequency of Jon's clapping?

Answer in units of Hz.



2. What is the speed of sound as determined by

Rosa and Jon? Answer in units of ft=s.



3. Rosa and Jon decided to test their results, so

they walked an additional 70 ft away from the

wall.

What is the new clapping frequency? An-

swer in units of Hz.



4. What

Answer 1

ok here goes They got 142 sounds per min or 2.3333 per second. Thus the distance was covered in .42 sec.

518ft (round trip) /.42 sec = 1225ft/sec.

Check

speed of sound = 1130 ft/sec pretty close must have been a hot day!!!

Answer 2

1 Hz= 1 cycle/second so:
71 claps in 30 seconds = 71/30 cycles (claps) in 1 second or approx. 2.37 Hz