41 tuning forks are arranged in increasing order of frequency such that each produces 5 beats/second with next tuning fork. If frequency of last tuning fork is double that of frequency of first fork. Then frequency of first and last fork is
- A$$400,200 \mathrm{~Hz}$$
- B$$200,400 \mathrm{~Hz}$$
- C$$100,200 \mathrm{~Hz}$$
- D$$205,410 \mathrm{~Hz}$$
✓ Correct answer: B
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