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What are matter waves ? A particle of mass m and charge q is accelerated from rest through a potential difference V. Obtain an expression for de Broglie wavelength associated with the particle.
Monochromatic light of frequency 5.0 × 10¹⁴ Hz is produced by a source of power output 3.315 mW. Calculate : (1) energy of the photon in the beam (2) number of photons emitted per second by the source
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