The total time for the sound to travel to the rock and back is 4 seconds. The one-way travel time is 2 seconds. Distance = speed × time = 346 m/s × 2 s = 692 meters.

Sound speed depends on the elasticity and density of the medium. Among the choices, iron is a solid with a high elastic modulus relative to its density, allowing sound waves to travel significantly faster through it than through water, air, or glass.

Fluids, including water, do not support shear stress, which is required for the propagation of transverse waves. Therefore, sound waves in water are strictly longitudinal, where the displacement of particles occurs parallel to the direction of wave propagation.

Musical sounds are characterized by regular, periodic vibrations that produce a pleasing effect on the listener. In contrast, noise is typically defined as irregular, non-periodic vibrations that are often perceived as harsh or unpleasant. The distinction is subjective but generally relies on the regularity of the waveform and the presence of harmonic overtones.

The speed of sound depends on the density and elasticity of the medium. Generally, sound travels fastest in solids, followed by liquids, and slowest in gases. Iron (a solid) has high elasticity, allowing sound to travel at approximately 5000 m/s. Water (a liquid) is intermediate at 1500 m/s, and air (a gas) is the slowest at approximately 343 m/s.

The blue whale is recognized as the loudest animal on Earth. Their vocalizations, which include low-frequency pulses, groans, and moans, can reach levels as high as 188 decibels. These sounds are incredibly powerful and can travel for hundreds of miles through the ocean, allowing blue whales to communicate with each other over vast distances in the deep sea.

Sound waves are mechanical waves, meaning they require a material medium (solid, liquid, or gas) to propagate through the vibration of particles. Therefore, the statement claiming they do not require a medium is incorrect. Sound waves cannot travel through a vacuum, which is the absence of a medium.

The speed of sound in a gas is dependent on the properties of the medium, specifically its temperature and composition, which includes humidity. Higher temperatures increase the average kinetic energy of gas molecules, leading to faster wave propagation. Similarly, humidity changes the density and average molecular mass of air, which also affects the speed of sound. While pressure affects density, in an ideal gas, the effects of pressure and density cancel out.

Assuming air behaves as an ideal gas, the speed of sound is given by v = sqrt(gamma * R * T / M). This formula shows that speed depends on temperature (T), the adiabatic index (gamma), and molar mass (M). Because density and pressure are linked by the ideal gas law (PV=nRT), changes in pressure at a constant temperature result in proportional changes in density, leaving the speed of sound unchanged.

The speed of sound in a gas is directly proportional to the square root of its absolute temperature. As temperature decreases, the kinetic energy of the gas molecules decreases, leading to a slower propagation of pressure waves through the medium. Therefore, the velocity of sound decreases as the temperature drops, a relationship described by the kinetic theory of gases.