Presenter A tells vivid stories but organizes the talk with no clear structure. Presenter B uses no stories but builds a tightly structured, logical argument. Based on audience-recall research, Presenter B’s message is more likely to be remembered accurately a week later. 

sound whose intensity exceeds an intensity of ___________ can damage the human ear after prolonged exposure.A. 10-12Wm2;B. 10-3Wm2;C. 10-7Wm2;D. 10-10Wm2;

What is the sound level β (in decibels) of an ultrasound with an intensity of 10-7Wm2?   Hint: β=10⋅log10(IIo)   where the threshold intensity Io=10-12Wm2.

The temperature of of a student is [tc] .oC. What is the temperature in Fahrenheit ?   TC = TF-32OF1.8→TF=?.

In some of Doppler’s experiments, musicians riding on an open train car played notes that were observed by a stationary observer as the train approached and passed by.   Calculate the observed frequency as a train approaches an observer given that the frequency the musicians are playing is f= [f] Hz, the velocity of the train is 12.8ms, and the velocity of sound is 341ms.   Hint: fobserved=fat the source⋅vwave(vwave)±vtrain. 

The threshold of hearing for the human ear isA. 10-12Wm2;B. 10-2Wm2;C. 102Wm2;D. 10-9Wm2;

Fluid pressure is always directedA. up.B. down.C. sideways.D. in all directions.

What is the wavelength, in m, of sound of frequency f= [f] Hz given the speed of sound to be 341ms ?   Hint: v=λ⋅f=λT, where λ is the wavelength, T=period. Calculate the answer to 3 significant digits.

Coanda effect means: A. A jet flow attaches itself to a nearby surface; B. A jet flow remains attached even when the surface curves away from the initial jet direction; C. It explains why eccentric mitral regurgitation jets are attracted and dispersed along adjacent left atrial wall surfaces. Check all that apply; Multiple answers question.

Fluid pressure is exerted evenly in all directions, which explains whyA. some objects float.B. birds and airplanes can fly.C. bubbles are round.D. objects seem to weigh less in water.