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  1. The number of photons of wavelength of 540 nm emitted per second by an electric bulb
  2. A radioactive nucleus of mass M emits a photon of frequency v and the nucleus recoils.
  3. Light of wavelength λᴀ and λᴃ falls on two identical metal plates A and B respectively.
  4. A steady current of 1.5 amp flows through a copper voltmeter for 10 minutes
  5. Length of a string tied to two rigid supports is 40 cm. Maximum length