Physics

Physics

Problem

A sound wave of frequency 1.2 kHz1.2\,\text{kHz} travels through air at a speed of 1080 km h−11080\,\text{km h}^{-1}. The wavelength of this wave in metres is a) 2.52.5 b) 0.0250.025 c) 0.250.25 d) 250250
Intuitive explanation

The key is connecting frequency, speed, and wavelength through the wave equation. Sound travels at a fixed speed through a medium, and that speed equals how many complete wave cycles pass a point per second (frequency) times the physical distance between those cycles (wavelength). Convert the speed to consistent units first, then use the relationship to find the missing wavelength.

Intuitive explanation

The key is connecting frequency, speed, and wavelength through the wave equation. Sound travels at a fixed speed through a medium, and that speed equals how many complete wave cycles pass a point per second (frequency) times the physical distance between those cycles (wavelength). Convert the speed to consistent units first, then use the relationship to find the missing wavelength.

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