Assuming an ideal noiseless opamp, find the noise level at and for the opamp circuit shown in Fig. P9.18. By what factor is the noise value at larger (or smaller) than ? How do you account for this...

Assuming an ideal noiseless opamp, find the noise level at and for the opamp circuit shown in Fig. P9.18. By what factor is the noise value at larger (or smaller) than ? How do you account for this increase (or decrease)? Also explain why the noise value at is smaller than .