A Longitudinal Wave Travels on a Slinky or Any Long

A longitudinal wave travels on a slinky or any long spring. The wave is represented by the equation z(z, t) = 1.2 cm cos(1800 rad/s t + 60 m⁻¹ z) . What are the wavenumber and direction of propagation of the wave?

A) 60 m⁻¹; traveling in the + z direction
B) 60 m⁻¹; traveling in the − z direction
C) 60 m⁻¹; traveling in the + x direction
D) 60 m⁻¹; traveling in the − x direction

Correct Answer:

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