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At which of the following angles are both the sin and cosine negative?

Which of the following BEST describes a specular reflector?

Calculate the decimal equivalent of the binary number 10101.

Using the diagram below, where the x-axis is time; The frequency of waveform 1 is ____________ the frequency of waveform 2 assuming the propagation velocity was the same.

How is the number 7,300,000,000 written in scientific notation?

What is the reciprocal of 0.25 kHz?

Using the diagram below; If the beam area is 2 cm2, what is the intensity of waveform 1?

What form(s) of attenuation are occurring in the areas indicated by the yellow arrows on the image below?

In a sound wave, what is the name given to regions where the pressure is higher than normal?

What happens to the power if the amplitude of a wave is doubled?