No, the intensity of a wave is directly proportional to the square of its amplitude. As the amplitude decreases, the intensity of the wave also decreases.
The amplitude of the input signal was set to 10 volts peak to peak and the frequency was set at 1 kHz.
Amplitude shift keying changes the height/power of the transmitted signal without altering the frequency. Frequency shift keying changes the frequency of the transmission without altering the height/power of the transmitted signal. Morse code is an example of amplitude keying where the amplitude is 0 or 100%. RTTY teleprinter uses FSK with two frequencies and the codes that represent text characters are sent with patterns of the two frequencies.