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  1. A particle of mass 1mg has the same wavelength as an electron moving with a velocity
  2. The de-Broglie wavelength of an electron having 80 eV of energy is nearly
  3. If the temperature of the sun were to increase from T to 2T and its radius from R and 2R
  4. A black body at a temperature of 227⁰C radiates heat at a rate of 20 cal m⁻²s⁻¹.
  5. A man throws balls with the same speed vertically upwards one after the other