Different sound notes have different ............

Hint: This question is based on the concept of sound, so first we need to understand what sound is, in order to solve this question. Sound is defined as vibrations that travel through the air or through any other medium as an audible mechanical wave. We can also say that sound is a form of energy that produces a sensation of hearing in our ears.

Complete answer:
There are five main characteristics of sound waves: wavelength, amplitude, frequency, time period, and velocity. This question is based on the frequency of sound.
Frequency, which is sometimes referred to as pitch, is the number of times per second that a sound pressure wave repeats itself. The SI unit of frequency is Hertz(Hz).
The sound note of a sound is basically dependent on the pitch of the sound and the pitch is dependent on the frequency of the sound.
Thus, we can say that different sound notes have different frequencies.

Additional information: Loudness is a property of sound by which we can distinguish between two sounds of same frequency and pitch. The loudness of a sound is measured with the help of the intensity of the sound. The intensity of the sound is further dependent on two factors- amplitude of the sound and how far they have travelled from the source of the sound.

Note: A sound of single frequency is known as the tone. When several frequencies are mixed, then the sound produced is known as a sound note. For example, a musical note has tons of various frequencies (sounds of different pitch) and amplitudes (loudness).