The human ear can distinguish sounds between 20 Hz and 20,000 Hz, inclusive. Give a compound inequality for the problem and graph your solution.

Radio waves are electromagnetic waves that travel at the speed of light, 300 000 kilometers per second. What is the wavelength of FM radio waves received at 100 megahertz on your radio dial?

Find the indicated term of the following arithmetic sequence.

17th term; $a_1=2.3 ; d=-2.3$

If a wave vibrates back and forth three times each second, and its wavelength is 2 meters, what is its frequency? Its period? Its speed?

While watching ocean waves at the dock of the bay, Otis notices that 10 waves pass beneath him in 30 seconds. He also notices that the crests of successive waves exactly coincide with the posts that are 5 meters apart. What are the period, frequency, wavelength, and speed of the ocean waves?

Whenever you want a high flying aircraft overhead, it seems that its sound comes from behind the craft rather than from where you see it. Why is this?

Astronomers find that light coming from point A at the edge of the sun has a slightly higher frequency than light from point B at the opposite side. What do these measurements tell us about the sun’s motion?

If a wave vibrates up and down twice each second and travels a distance of 20 m each second, what is its frequency? Its wave speed?

The wave patterns seen in Figures $19.4$ and $19.8$ are composed of circles. What does this tell you about the speed of waves moving in different directions?

Red light has a longer wavelength than violet light. Which has the greater frequency?

The lowest frequency we can hear is about 20 Hz. Calculate the wavelength associated with this frequency for sound that travels at 340 m/s. How long is this in feet?

Calculate the speed of waves in water that are 0.4 m apart and have a frequency of 2 Hz.

Indicate whether the value, $b=5 ; 60-10 b \leq 20$, is a solution to the inequality. Discuss.

What is the solution set of the inequality 3n > - 6?

F. All real numbers less than 2 .

G. All real numbers less than -2.

H. All real numbers greater than 2 .

J. All real numbers greater than -2.