Longitudinal wave of a slinky has a frequency of 6 Hz. It takes 15 s for the wave to travel through 20 meters long slinky. What is the wavelenght?

Glencoe Physics: Principles and Problems, Student Edition
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Chapter15: Sound
Section: Chapter Questions
Problem 29A
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1. Longitudinal wave of a slinky has a frequency of 6 Hz. It takes 15 s for the wave to travel through 20 meters long slinky. What is the wavelenght?

2. The buzzing sound from a bee is produced when the bee beasts its wing at an average rate of 870 beasts per second. What is the frequency and wavelength of the sound?

3. a 25 electric lamp is placed in 1.5 meters from the screen of A photometer and produces the same illuminance as a lamp of unknown intensity placed 2 meters away. Determine the luminous intensity of electrical lamp.

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