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Quiz1-9AM

# Quiz1-9AM - Physics 1C 9 am Quiz#1 Name Student ID 1 Which...

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Physics 1C - 9 am - Quiz #1 Name___________________________________ Student ID#____________________________________ 1) Which of the following is NOT true of ultrasound imaging? A) Harder, denser objects appear brighter in ultrasound images B) The probe sends waves into the body at a variety of different angles C) When an ultrasound wave hits a tumor it is completely reflected D) The probe is held against the skin E) All of the above statements are true 1) 2) Ultrasound imaging is used to detect a tumor deep within the body. Suppose the ultrasound wave travels through the healthy tissue above the tumor at an average speed of 1500 m/s, and travels through the tumor tissue at 1000 m/s. If the top surface of the tumor lies 2 cm below the ultrasound probe and the tumor extends 3 cm further below that, how many microseconds does it take an ultrasound wave to travel from the probe, reflect off the bottom of the tumor, and return back to the probe? 2) 3) The frequency of vibration w of an object-spring system is 4 Hz when a 5 g mass is attached to the spring. What is the spring constant k of the spring?

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