For a mass-spring system T = 2π√(m/k), so it depends on both mass and spring constant.

Unequal amplitudes with a phase difference (other than 0 or π) produce an ellipse as the Lissajous figure, so option C is correct.

Transverse waves require a shear-supporting medium and thus propagate in solids (like metals) but not in gases.

The superposition principle states that displacements due to multiple waves add algebraically, so addition is used.

Wavelength = speed / frequency = 10 m s^-1 / 10 s^-1 = 1 m.

For SHM vmax = ωA and amax = ω^2 A; setting them equal gives ω = 1 rad/s, so T = 2π/ω = 2π ≈ 6.28 s.

Water waves produced by a stone are primarily transverse on the surface, so option A is the transverse example.

By definition, the period is the time for one complete oscillation (one full cycle).

Sound waves in air are longitudinal and do not exhibit polarization, unlike transverse electromagnetic waves.

Amplitude is proportional to the square root of intensity, so amplitude ratio = sqrt(1):sqrt(16) = 1:4.