If the sound heard by observer, whose equation is given as y=8 \sin 10 \\pit \cos 200 \\pit at x=0, then number of beat frequency heard by observer is 2 {k}. Then the value of {k} is

JEE Advanced 2021 Full Test 5 Paper 2

SECTION – C (Numerical Answer Type)
This section contains 06 questions. The answer to each question is a NUMERICAL VALUE. For each question, enter the correct numerical value (in decimal notation, truncated/rounded‐off to the second decimal place; e.g. XXXXX.XX).

Question : 18 of 54

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If the sound heard by observer, whose equation is given as y=8‌sin‌10‌π‌t‌cos‌200‌π‌t at x=0, then number of beat frequency heard by observer is 2k. Then the value of k is

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