Question

The frequency f1 and f2 from the below picture are respectively called ___________

(a) lower cut-off frequency and upper cut-off frequency

(b) upper cut-off frequency and lower cut-off frequency

(c) left frequency, right frequency

(d) there is no specific name

I had been asked this question by my school teacher while I was bunking the class.

I'm obligated to ask this question of General Frequency Consideration topic in chapter Transistor Biasing and Low Frequencies of Analog Circuits

Answer 1

Right answer is (a) lower cut-off frequency and upper cut-off frequency

To elaborate: The frequencies are called lower cut-off frequency and upper cut-off frequency. At these frequencies power of the signal becomes half of its original value, 3dB less than the maximum and they are also called 3dB cut-off frequencies.