As the temperature increases, materials with
coefficients of linear
expansion increase a lot in size, while materials with small coefficients of
linear expansion increase a little in size,

large

Explanation:

As the temperature increases, materials with large coefficients of linear expansion increases a lot in size

diagram is missing, but i will try to explain your doubt.

answer:

amplitude is the maximum displacement or distance moved on a point of a vibrating body or wave measured from its equilibrium position.it is equal to half the length of vibration path.