- #1
Ronaldo21
- 30
- 0
Fundamental frequency!
1. Ultrasound with a frequency of 4.079 MHz can be used to produce images of the human
body.If the speed of sound in the body is the same (1.97 km/s) as in salt water, what is the
wavelength in the body?
Answer in units of m.
and
2. On a day when the wind is blowing 49.5 km/h from east to west, a fire engine
moves toward you from the west at 112 km/h and you are heading toward the fire engine at
94.6 km/h. If the fire engine has a 587 Hz siren and the speed of sound is 340 m/s, what frequency do you hear?
Answer in units of Hz.
i converted them to m/s. (340-12-30.2777)*1170/(340-12-30.27777) but i think i did it wrong. idk. grr
and i DO NOT know how to do number 1
please help!
1. Ultrasound with a frequency of 4.079 MHz can be used to produce images of the human
body.If the speed of sound in the body is the same (1.97 km/s) as in salt water, what is the
wavelength in the body?
Answer in units of m.
and
2. On a day when the wind is blowing 49.5 km/h from east to west, a fire engine
moves toward you from the west at 112 km/h and you are heading toward the fire engine at
94.6 km/h. If the fire engine has a 587 Hz siren and the speed of sound is 340 m/s, what frequency do you hear?
Answer in units of Hz.
i converted them to m/s. (340-12-30.2777)*1170/(340-12-30.27777) but i think i did it wrong. idk. grr
and i DO NOT know how to do number 1
please help!