Doubling the frequency of a sound wave would result in a higher pitch or higher tone. For example, if a sound wave originally had a frequency of 440 Hz, doubling the frequency would raise it to 880 Hz. The perception of pitch is directly related to the frequency of a sound wave, so doubling the frequency would make the sound appear higher in pitch.
On the other hand, doubling the amplitude of a sound wave would increase its intensity or loudness. If the original sound wave had a certain amplitude, doubling it would make the sound appear twice as loud. The amplitude of a sound wave is related to the amount of energy carried by the wave, so increasing the amplitude increases the energy and therefore the perceived loudness of the sound.
It's worth noting that doubling the frequency or amplitude of a sound wave can have different effects depending on the context and the specific characteristics of the sound source. These changes may alter the perceived quality or timbre of the sound as well.