Time for 30 vibrations = 30/400 = 0.075 s; distance = v·t = 320·0.075 = 24 m.

Level = 10 log10(I/I0) = 10 log10(10^6) = 10×6 = 60 dB.

SONAR (Sound Navigation and Ranging) uses reflection of sound waves to detect objects underwater.

Sound travels faster in lighter gases; hydrogen (H2) is the lightest listed, so sound speed is greatest in H2.

f_min = f·(c/(c + v)) ≈ 1000·(352/(352+21.99)) ≈ 941.9 Hz, so about 941 Hz.

Laplace corrected Newton by noting sound propagation involves rapid changes without heat exchange, i.e., adiabatic propagation.

Shock waves form when an object moves faster than the speed of sound in the medium, creating overlapping wavefronts.

Sound speed in gases is higher when molecular mass is lower; hydrogen (H2) has the lowest molecular mass here, so highest speed.

A tube open at both ends has fundamental f = v/(2L) and supports all harmonics (both even and odd), so the option stating v/2L with all harmonics is correct.

Using mole-fraction weighted mean molecular mass (μ = 8) and v ∝ 1/√μ, the mixture speed evaluates to ≈635 m/s.