Wave Speed Problems

The average wavelength in a series of ocean waves is 15m. A wave crest arrives at the ashore on average every 10 seconds so that the frequency is 0.500 Hz. What is the average speed of the waves?

• 1.50 m/s

• 7.50 m/s

• .033 m/s

• 5 m/s

An FM radio station broadcasts electromagnetic waves at a frequency of 94.5 MHz (9.45 x 10⁷ Hz). These radio waves have a wavelength of 4.17m. What is the speed of the waves?

• 3.94 x 10⁸ m/s

• 3.00 x 10⁸ m/s

• 3.00 x 10⁷ m/s

Green light has a wavelength of 5.20 x 10^-7 m. The speed of light is 3.00 x 10⁸ m/s. Calculate the frequency of green light waves with this wavelength.

• 5.77 x 10¹⁴ Hz

• 4.18 x 10⁸ Hz

• 3.26 x 10⁸ Hz

The speed of sound in air is about 340 m/s. What is the wavelength of a sound wave with a frequency of 720 Hz?

• 2.45 hz

• 1.7 m

• .47 m