12. consider a wave generator that produces 10 pulses per second. The speed of t

Question

12. consider a wave generator that produces 10 pulses per second. The speed of the wave is 300m/s. What happens to the wavelenth if the frequency of pulses is increased?
a. wavelength increases
b. wavelength decreases
c. wavelength does not change
d. the wave will move faster

13. Sally enjoyed the opportunity to collect data from standing waves in a spring. She and her partner held the ends of the spring 4.0 meters apart. There were 5 nodes in the standing wave produced. Sally moved her hand fromt he rest position back and forth along the floor 20 times in 4 seconds. What is the wavelength of the wave Sally made?
a. 6 m
b. 1 m
c. 2 m
d. 4 m

Explanation / Answer

12. The frequency of the wave inversely caries with the wavelength i.e. v = f Where v is the speed of the wave f is the frequency is the wavelength If frequensy is increased, wavelength is decreased Option B is correct choice 13. The number of nodes formed in the spring n = 5 Therefore the number of loops formed by the spring is m = n-1 = 4 The length of the each loop is l = /2 Where is the wavelength Therefore the length of the spring is L = m/2 4 m = 4/2 = 2 m Option C is the correct choice 12. The frequency of the wave inversely caries with the wavelength i.e. v = f Where v is the speed of the wave f is the frequency is the wavelength If frequensy is increased, wavelength is decreased Option B is correct choice 13. The number of nodes formed in the spring n = 5 Therefore the number of loops formed by the spring is m = n-1 = 4 The length of the each loop is l = /2 Where is the wavelength Therefore the length of the spring is L = m/2 4 m = 4/2 = 2 m Option C is the correct choice Option C is the correct choice

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