3 Calculate the gradient of the graph in Figure 1.6. 10.0 8.0 6.0 I 4.0 2.0 0 0 1.0 2.0 3.0 4.0 VV Figure 1.6​

What makes thermal imaging cameras useful? they can detect differences in color. they can detect differences in wave speeds. they can detect differences in temperature. they can detect mechanical waves.