Answers to Sound and Ultrasound Questions
1) wavespeed = frequency x wavelength = 200 x 20000 = 4000000m/s
b) time = distance/ speed = 20m (remember the sound has to go there and back) / 4000000 = 5 microseconds
c) It has a higher pitch
2) 10m
b) speed = distance/time = 10/3 = 3.3m/s
c) frequency = speed/wavelength = 3.3/0.3 =11Hz
3) time = distance/speed = 0.05 (remember to turn cm into m)/ 300 = 0.000017s
b) It has to go there and back so will take twice as long =0.000033s
c) wavelength = frequency/ wavespeed = 2000000 ( remember MHz are million Hz) / 300 = 6700m
b) time = distance/ speed = 20m (remember the sound has to go there and back) / 4000000 = 5 microseconds
c) It has a higher pitch
2) 10m
b) speed = distance/time = 10/3 = 3.3m/s
c) frequency = speed/wavelength = 3.3/0.3 =11Hz
3) time = distance/speed = 0.05 (remember to turn cm into m)/ 300 = 0.000017s
b) It has to go there and back so will take twice as long =0.000033s
c) wavelength = frequency/ wavespeed = 2000000 ( remember MHz are million Hz) / 300 = 6700m