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What is the frequency of the motor driving a string with waves of wavelength 0.48 m traveling at 48 m/s?
What is the frequency of the motor driving a string with waves of wavelength 0.48 m traveling at 48 m/s?
- 4 Hz
- 8 Hz (correct)
- 12 Hz
- 6 Hz
If the speed of the waves on the string increases to 96 m/s, what happens to the wavelength if the frequency remains constant at 10 Hz?
If the speed of the waves on the string increases to 96 m/s, what happens to the wavelength if the frequency remains constant at 10 Hz?
- It becomes 0.24 m (correct)
- It becomes 0.96 m
- It becomes 4.8 m
- It becomes 5.6 m
If the frequency is doubled to 20 Hz, what effect does this have on the wavelength?
If the frequency is doubled to 20 Hz, what effect does this have on the wavelength?
- It is halved (correct)
- It remains the same
- It increases by a factor of 4
- It doubles
What would be the new speed of the waves on the string if the frequency is halved to 5 Hz with a wavelength of 0.48 m?
What would be the new speed of the waves on the string if the frequency is halved to 5 Hz with a wavelength of 0.48 m?
If the waves have a wavelength of 9.6 m, what is the corresponding frequency when the speed is 48 m/s?
If the waves have a wavelength of 9.6 m, what is the corresponding frequency when the speed is 48 m/s?
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Study Notes
Wave Properties and Relationships
- The speed of a wave (v) can be calculated using the formula: v = f × λ, where f is frequency and λ is wavelength.
- For a string with a wavelength of 0.48 m traveling at a speed of 48 m/s, the frequency can be determined as follows:
- f = v / λ = 48 m/s / 0.48 m = 100 Hz.
Changes in Speed and Wavelength
- If the speed of waves on the string increases to 96 m/s while maintaining a constant frequency of 10 Hz, the wavelength will change because:
- λ = v / f = 96 m/s / 10 Hz = 9.6 m.
Effects of Doubling Frequency
- Doubling the frequency from 10 Hz to 20 Hz results in a decrease in wavelength while speed remains constant:
- If the speed is still 96 m/s, then λ = v / f = 96 m/s / 20 Hz = 4.8 m.
Speed Changes with Frequency Adjustment
- Halving the frequency from 10 Hz to 5 Hz while maintaining a wavelength of 0.48 m requires recalculating the new speed:
- Using the formula v = f × λ = 5 Hz × 0.48 m = 2.4 m/s.
Frequency Calculation with Given Wavelength
- For waves with a wavelength of 9.6 m and a speed of 48 m/s, the corresponding frequency can be calculated:
- f = v / λ = 48 m/s / 9.6 m = 5 Hz.
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