Explanation:
During propagation of mechanical wave each particles displaces from zero to maximum i.e., upto amplitude So amplitude of each particle is equal. Verifies the option (b).
For progressive wave medium particles oscillates about their mean position in which restoring force $\text{F}\propto(-\text{y}).$ So motion of medium particles is simple harmonic motion. So verifies the option(c).For progressive wave propagating in a medium of density $(\rho)$ and Bulk modulus k the velocity $(\nu)$
As the depends on k and $(\rho)$ and k, $(\rho)$ are different for different medium so of wave depends on nature of medium, hence, verifies the option (d).
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