Why Is My Calculated Speed of Sound Incorrect?

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SUMMARY

The calculated speed of sound using an ultrasound emitter connected to EasySense software yielded a result of 624.02 meters per second, significantly higher than the known speed of 337 meters per second at 20 degrees Celsius. The distance covered was correctly noted as 6.8 meters for the round trip, and the time recorded was 0.010837 microseconds, which converts to 0.010897 seconds. The discrepancy in the calculated speed indicates potential errors in measurement or misunderstanding of the experimental setup, particularly regarding the distance and time measurements.

PREREQUISITES
  • Understanding of basic physics concepts, particularly speed calculation.
  • Familiarity with ultrasound technology and its applications.
  • Knowledge of data recording software, specifically EasySense.
  • Ability to convert units, particularly microseconds to seconds.
NEXT STEPS
  • Review the principles of speed calculation using the formula Speed = Distance / Time.
  • Investigate the functionality and calibration of EasySense software for accurate data recording.
  • Learn about potential sources of error in ultrasound measurements, including reflection issues.
  • Explore methods to verify distance measurements in experimental setups.
USEFUL FOR

Students in physics or engineering courses, educators teaching sound wave properties, and anyone conducting experiments involving ultrasound technology.

Astonix
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Homework Statement



We have to prove the speed of sound using a ultra-sound emitter, connected to EasySense software which records the speed for it to travel to surface and back. Known data - Speed of sound is 337 metres a second at 20 degrees celsius. Also, the distance covered is, 3.4m or 6.8m there and back. The time is 0.010837 micro seconds. Micro-seconds are 1 x 10^-6. All answers must be given with a +- .

Homework Equations



Speed = Distance / Time

The Attempt at a Solution



Time: 10897 +- 14 (microsecs)
Dist: 6.8 +- 0.014 (metres)

Convert microseconds into seconds. 10897 / 1000 and then /1000 again.
= 0.010897 seconds

Speed = 6.8 / 0.010897 = 624.024961 metres per second.

Obviously, this is nearly double the actual speed of sound. Was I not meant to double the distance? But I'm pretty sure the time is for there and back so double distance was needed. Have I forgotten anything? Of course, there is a chance the Ultrasound was reflecting from a place not wanted, causing the distance to not be true.

Help much appreciated.
 
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Astonix said:

Homework Statement



We have to prove the speed of sound using a ultra-sound emitter, connected to EasySense software which records the speed for it to travel to surface and back. Known data - Speed of sound is 337 metres a second at 20 degrees celsius. Also, the distance covered is, 3.4m or 6.8m there and back. The time is 0.010837 micro seconds. Micro-seconds are 1 x 10^-6. All answers must be given with a +- .

Homework Equations



Speed = Distance / Time

The Attempt at a Solution



Time: 10897 +- 14 (microsecs)
Dist: 6.8 +- 0.014 (metres)

Convert microseconds into seconds. 10897 / 1000 and then /1000 again.
= 0.010897 seconds

Speed = 6.8 / 0.010897 = 624.024961 metres per second.

Obviously, this is nearly double the actual speed of sound. Was I not meant to double the distance? But I'm pretty sure the time is for there and back so double distance was needed. Have I forgotten anything? Of course, there is a chance the Ultrasound was reflecting from a place not wanted, causing the distance to not be true.

Help much appreciated.

You have very different times in 1 and 3 above. Could you also have misunderstood the distance?
 

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