Waves:
1. Find the wavelength of the ultrasonic wave emitted by a bat if it has a frequency of 4.0 x 104 Hz.
2. Radio station KSON in San Diego broadcasts at both 1240kHz (AM) and 97.3 MHZ (FM) a) which of these signals, AM or FM has the longer wavelength? (Remember they both travel at the same speed). B) Find the length of each.
3. An Anchor is being hoisted out of the water, it hits the hull of the ship, causing the anchor to vibrate with a frequency of 150Hz. If the speed of sound in sea water is 1520 m/s, how many wavelengths of sound will fit between the boat and the ocean bottom 395 m below?
4. At a Canadiens Hockey game, the crowd starts doing the “wave” at a speed of 20m.s and it has a frequency of 0.5Hz. What is the distance from crest to crest?
5. How long does it take for the light from the sun to reach Earth if the sun is 1.50 x 1011 m away?
6. Microwave ovens emit waves of about 2450MHz. What is the wavelength of this light? (c=3.00 x 108)
7. When you look at a distant star or planet, you are looking back in time. How far back in time are you looking when you observe Pluto through the telescope from a distance of 5.91 x 1012m?
8. If a person could travel at the speed of light, it would still take 4.3 years to reach the nearest star, Proxima Centauri. How far away, in meters, is Proxima Centauri?
9. When you go out in the sun, it is the ultraviolet light that gives you a tan (or burn). The pigment in your skin called melanin is activated by the enzyme tyrosinase, which has been stimulated by ultraviolet light. What is the wavelength of this light if it has a frequency of 7.89 x 1014Hz?
10. IRAS, the Infrared Astronomy Satellite launched by NASA in 1983, had a detector that was supercooled to enable it to measure infrared or heat radiation from different regions of space. What is the frequency of infrared light that has a wavelength of 1.00 x 10-6m?