1. Differentiate between mechanical and electromagnetic waves. Give examples.
2. Draw a wave and identify the primary parts.
3. Find the speed of a 500 Hz wave with a wavelength of 0.4 m.
3. What is the frequency of a wave that travels at 24 m/s, if 3 wavelengths of the wave fit in a 12-m space. (Hint: find the wavelength first.)
4. Approximately how much greater is the speed of light than the speed of sound?
5. Draw the first 3 harmonics for a wave on a string. If the length of the string is 1-m, find the wavelengths of these harmonics.
6. Show how to compute the wavelength of WTMD's signal (89.7 MHz). Note that MHz means 'million Hz."
7. Explain the Chladni plate seen in class.
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. Given a 440 Hz concert A, find the following frequencies: one octave below, the note A# (one semi-tone above), the note B (2 semi-tones above).
*10. Explain the Ruben's tube from class.
*11. Consider an organ pipe 0.5-m long. If the speed of sound is 340 m/s, find (and draw) the first 3 harmonics (wavelengths and frequencies).
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