No, it is not possible to directly measure the wavelength of a single photon. Wavelength is a property of waves, and photons are individual quantum particles of light that exhibit both wave-like and particle-like behavior. While the concept of wavelength applies to photons as they exhibit wave-particle duality, the measurement of a single photon's wavelength is not feasible.
Wavelength is typically measured by studying the behavior of a large number of photons collectively. In experiments involving light, scientists can determine the wavelength by using techniques such as interference, diffraction, or spectroscopy, which rely on the behavior of light waves. These methods involve the interaction of many photons over a period of time or through interactions with materials.
However, it is important to note that in certain experiments, such as those involving quantum optics or single-photon sources, researchers can indirectly infer or manipulate the wavelength of individual photons based on the behavior they exhibit when interacting with other particles or materials.