Name Section Date Lab XI -Wave Motion and the Speed of Sound Prelab 1. What is a

Question

Name Section Date Lab XI -Wave Motion and the Speed of Sound Prelab 1. What is a wave? How is wave speed related to frequency and wavelength? How is the period of oscillation related to the wave speed? 2. How does superposition produce interference between two waves? What are nodes and antinodes? What causes them in the standing wave pattern? 3. Stringed musical instruments, such as "fiddles' and banjos, used stretched strings. Explain (a) how tightening and loosening the strings tune them to their designated pitch or frequency; (b) why the strings of lower tones are when the fingers are placed on the strings pressing the string against a fret. 85

Explanation / Answer

1. wave is the disturbance produced in the medium which transfers energy without the actual movement of the particles of the medium.       wave speed = wavelength * frequency = wavelength / time period

2. when two waves superimpose on each other such that crust of one wave + crust of second wave    or trough + trough   gives constructive interference

crust or trough of first wave + trough or crust of second wave ..it is destructive interference

node...the position of max displacement of the particles

antinode ...the position of minimum displacement of the particles which is zero

4. since frequency of sound is inversely proportional to the resonating length ...by varying fingers position hence change in length

5. pitch ..related to frequency

loudness....related to intensity...which then proportional to A^2

quality....differnt waveshapes

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