Name the conditions required for two waves on a rope to interfere completely destructively.

What are two differences between the red and green electromagnetic waves in a rainbow?

What conditions are required for two waves on a rope to interfere completely destructively?

Compare and contrast the sound waves produced by someone whispering and someone shouting.

Explain how sound waves can be used to find underwater objects.

A fisherman notices a buoy bobbing up and down in the water in ripples produced by waves from a passing speedboat. These waves travel at 2.5 m/s and have a wavelength of 7.5 m. At what frequency does the buoy bob up and down?

Radio waves broadcast at $95.3 \mathrm{MHz}$ travel at a speed of $3 \times 10^8 \mathrm{~m} / \mathrm{s}$. What is the wavelength of the radio waves? (Remember that one $\mathrm{MHz}$ is $10^6 \mathrm{~Hz}$.)

Under what conditions do two waves produce destructive interference?

A radio station, $98.1$ on the $\mathrm{FM}$ dial, has radio waves with a frequency of $98.1$ million cycles per second. Write an equation in the form $d = \sin \omega t$ for the simple harmonic motion of the radio waves

Does a destructive interference of waves occur when two crests meet?

What happens when two sound waves meet in constructive interference?

Two strings are made of the same material and have equal tensions. String $1$ is thick; string $2$ is thin. Is the speed of waves on string $1$ greater than, less than, or equal to the speed of waves on string $2$?

Light, x-rays, microwaves, and radio waves are examples of which type of energy?

Two ultrasonic sound waves combine and form a beat frequency that is in the range of human hearing. The frequency of one of the ultrasonic waves is 70 kHz. What is (a) the smallest possible and (b) the largest possible value for the frequency of the other ultrasonic wave?