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  1. Source S₁ is producing, 10¹⁵ photons per second of wavelength 5000Å
  2. A body A experiences perfectly elastic collision with a stationary body B
  3. When the disc rotates with uniform angulr velocity.Which of the following is not true?
  4. A high altitude, a body explodes at rest into two equal fragments with one fragment
  5. Two tuning forks are sounded together and produce 2 beats per second.