for how many days did india is free from corona 27.The number of vibrations made by a vibrating body in one second is called______ *
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1/Some early studies suggest between 1 in 5 and 1 in 10 people with COVID-19 will experience symptoms lasting longer than a month. A majority of those who were admitted to hospital with severe disease report long-term problems including fatigue and shortness of breath
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27/The number of cycles that a vibrating object completes in one second is called frequency. The unit of frequency is hertz (Hz).
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frequency
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