1. Differentiate between mechanical and electromagnetic waves. Give examples.
2. Draw a wave and identify the primary parts (wavelength, crest, trough, amplitude).
3. Find the speed of a 500 Hz wave with a wavelength of 0.4 m.
4. What is the frequency of a wave that travels at 24 m/s, if 3 full waves fit in a 12-m space? (Hint: find the wavelength first.)
5. Approximately how much greater is the speed of light than the speed of sound?
6. Harmonics
a. Draw the first 3 harmonics for a wave on a string.
b. If the length of the string is 1-m, find the wavelengths of these harmonics.
c. If the frequency of the first harmonic (n = 1) is 10 Hz, find the frequencies of the next 2 harmonics.
d. Find the speeds of the 3 harmonics.
a. Draw the first 3 harmonics for a wave on a string.
b. If the length of the string is 1-m, find the wavelengths of these harmonics.
c. If the frequency of the first harmonic (n = 1) is 10 Hz, find the frequencies of the next 2 harmonics.
d. Find the speeds of the 3 harmonics.
7. Compute the wavelength of the radio signal 107.9. Note that MHz means 'million Hz."
8. A C-note vibrates at 262 Hz (approximately). Find the frequencies of the next 2 C's (1 and 2 octaves above this one).
9. A red LED has a wavelength of 662 nm. What is the frequency of light emitted from it?
9. A red LED has a wavelength of 662 nm. What is the frequency of light emitted from it?
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