The kelvin temperature/scale i think
        
             
        
        
        
We have that the letter A in the diagram below given as
Amplitude
Option A
<h3>
Amplitude</h3>
Question Parameters:
Amplitude
Crest
Trough
Wavelength
Generally, the amplitude of a wave is the maximum  displacement of the wave in the medium from its initial position. 
Amplitude is denoted with the letter A
Therefore,Amplitude
Option A
For more information on displacement visit
brainly.com/question/989117
 
        
             
        
        
        
Answer:
Increasing the tension on a string increases the speed of a wave, which increases the frequency (for a given length). Pressing the finger at different places changes the length of string, which changes the wavelength of standing wave, affecting the frequency.
Explanation:
 
        
             
        
        
        
A place that is cold because of an increase in altitude has a mountain area climate or simply, mountain climate. An area that is high in altitude typically has a colder temperature because of the increased amount of rainfall they have. Also, air tends to cool as it rises in temperature.