defence exam Indian Army Nursing Assistant Mock Test Series 2025 Physics Waves Traveling Sound Waves

यदि हम जानते हैं कि कोई वस्तु 5 सेकण्ड में 100 बार दोलन करती है, तो उसकी आवृत्ति क्या होगी?

1
50 Hz
2
200 Hz
3
20 Hz
4
100 Hz
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