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JEE Main · 2019 · 10 Apr 2019 · Shift 2 · Waves & Sound

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The correct figure that shows, schematically, the wave pattern produced by superposition of two waves of frequencies 9 Hz and 11 Hz,
  1. (A)(see structure)
    ✓ Correct
  2. (B)(see structure)
  3. (C)(see structure)
  4. (D)(see structure)

Answer: (A)

Solution

Two tones of and sounded together beat against each other. Their superposition is a fast oscillation at the average frequency , but its amplitude swells and fades at the beat frequency . The pattern that fits is a carrier wrapped in an envelope that waxes and wanes twice every second.

JEE Main · 2019 · 10 Apr 2019 · Shift 2 · Single correct option

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