defence exam CRPF ASI Technical Mock Test 2023 Electronic Mechanic Electric Components Electrical Basics

यदि एक साइन तरंग की अवधि T 40 μs है तो इसकी आवृत्ति _______ है। 

1
40 kHz
2
250 kHz
3
25 kHz
4
2.5 kHz
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