ಕೆಳಗಿನವುಗಳಲ್ಲಿ ಯಾವುದು 'ತರಂಗದ' ಗುಣಲಕ್ಷಣವಲ್ಲ?

Wavelength, amplitude and frequency are properties of a wave. The medium is what a mechanical wave travels through; it is not a characteristic of the wave, and light needs no medium at all.