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A diver shines an underwater flashlight at the surface of the sea (n=1.44).  At what angle of incidence, θ, will the light begin to be totally internally reflected? (Select closest answer)

 A dolphin is swimming toward a wall at the speed shown above.  The dolphin emits a “chirp” at 50 kHz to echo-locate the wall.  If this sound pulse is reflected back, what is the frequency of the echo received by the dolphin?  Show and explain all work.  (The bulk modulus of sea water is β = 2.25 x 109 N/m2 and the density of the water is ρ = 1.00 x 103 kg/m3.)

  A puddle in the street contains a 5-cm layer of oil floating on top of water. With the shown angle of incidence from the air into the oil,  what is the angle of refraction into the water? (Select closest answer)

Dear all. Please note that the submission time has been changed from midnight to 18:00 so that you can spent the rest of the evening and part of the next day on the lesson activity (which should be submitted the next day on or before midday).You are strongly advised to complete the quiz way before the deadline so that you dedicate enough time to the lesson activity. Submission on the deadline is discouraged because you will not have adequate time for the activity.

When can a pt use the modified 3-point gait pattern?

You are preparing written precautions for ambulation in the home with an AD.  Which of the following would not be considered appropriate precautions to include?

List the two different types of equipment that are commonly used for pre-ambulation training and how each one provides a benefit to the patient.

You are assigned a new patient today.  You are trying to decide whether he should be using an assistive device or not.  Which of the following would indicate the need for the use of an assistive device?

You are verifying that your patient’s walker fits adequately.   According to your book, what is the angle of elbow flexion that a patient should have when holding the handgrip of the AD?

You are covering for a PTA who is out sick today. You are to gait train a patient who is FWB. Which of the following ADs are best indicated for patients, with FWB, to use safely?