No, in the context of physics, wavelength cannot be negative. Wavelength is a physical quantity that represents the distance between two corresponding points on a wave, such as the distance between two wave crests or two wave troughs.
Wavelength is typically expressed as a positive value, representing the distance in space between wave features. It is a measure of the length of one complete cycle of a wave. For example, in the case of electromagnetic waves like light, the wavelength can range from very short values, such as nanometers (10^-9 meters) for visible light, to much longer values like meters or kilometers for radio waves.
While there are mathematical concepts that involve negative values, such as negative numbers, in the context of wavelength and wave phenomena, negative wavelengths do not have physical significance. Wavelength is generally considered as a positive quantity in physics.