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  1. A string in musical instrument is 50 cm long and its fundamental frequency is 800 Hz.
  2. A stationary particle explodes into two particles of masses m₁ and m₂ which move
  3. A light whose frequency is equal to 6.0 x 10¹⁴ Hz is incident on a metal
  4. In an NPN transistor the collector current is 24 mA. If 80% of the electrons
  5. 4.0 g of a gas occupies 22.4 litres at NTP. The specific heat capacity of the gas