Questions asked
In the spectrogram seen here, of spoken English, is the speaker asking a question? vcspectrogram.gif Group of answer choices Yes No Not possible to tell
In the resonance graph pictured here, what does the y-axis represent? reso copy.png Group of answer choices the natural frequency the driving frequency both a and b amplitude (oscillation response) none of the above
Using clicks and squeaks a dolphin determines through echolocation that a pod of killer whales is 50m away. How much time does its sound signal take between emitting and receiving the reflection? Group of answer choices 588ms 294ms 133ms 67ms not enough information to tell (depends on whether the sound was a click or a squeak)
Suppose hypothetically that the threshold reference level for the decibel scale were set at 10^-10 instead of 10^-12. What would the new or revised decibel level be for sound previously having 0 dB? Group of answer choices -2 dB -20 dB 2 dB 20 dB 100 dB
How many orders of magnitude (powers of 10) does human hearing typically span in intensity (I)? Group of answer choices 1 2 3 4 more than 4
Considering the sound wave pictured, what is the period closest to? Picture1.png Group of answer choices 1ms 2ms 4ms 8ms only the wavelength can be deduced from the given picture
By way of analogy, an adult that is stopped because she is too tall to ride a roller coaster intended for children, is like a Group of answer choices low pass filter high pass filter band pass filter band stop filter both a and c
A typical ultrasound frequency is 0.1MHz; as a factor or ratio, how much larger is this than the highest frequencies that humans can normally hear? Group of answer choices 2 times larger 5 times larger 20 times larger 50 times larger none of the above
A stadium wave, in the way that its oscillators are at right angles to the propagation direction, is most like Group of answer choices sound waves (in air) light waves earthquake P-waves ocean waves sound waves (in water)
according to cnnmoney.com, 25% of US households have two or more refrigerators a survey of 1200 homes in California found that 300 had two or more refrigerators. Is this higher than the national average find the P value and make a decision at the 0.05 level of significance and state that conclusion.