Intensity is the magnitude of (some quality, such as) power or size.
If the current in a wire is doubled, the magnetic field intensity around the wire will also double. This is because the magnetic field strength is directly proportional to the current flowing through the wire according to Ampere's Law.
Pitch refers to the perceived frequency of a sound, whether it is high or low. Intensity, on the other hand, refers to the level of loudness or softness of a sound. In other words, pitch is related to the frequency of the sound wave, while intensity is related to the amplitude of the sound wave.
The Fujita Scale is used to rate the intensity of a tornado by examining the damage caused by the tornado after it has passed over a man-made structure. These range from F0 (Gale Tornado) with minor roof and tree damage, to F5 (Incredible Tornado) with homes wiped clean of their foundations.