railway RRB JE (CBT I + CBT II) Mock Test 2024 Network Theory Basic Filters and Locus Diagrams

The output power of a filter is 100 mW when the signal frequency is 5 kHz. When the frequency is increased to 25 kHz, the output power falls to 50 mW. What is the dB change in power?

1
-3 dB
2
-5 dB
3
-7 dB
4
-2 dB
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