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78.The de-Broglie wavelength of an electron travelling with 10% of velocity of light is equal to 1) 242.4 pm 2) 24.2 pm 3) 2.42 pm 4) 0.2424 pm Q2) the number of photons of light of wavelength 7000A equivalent to 1 J are 1)3.52×10 -18 2) 3.52×10 18 3) 50000 4) 100000 |
| Answer» 78.The de-Broglie wavelength of an electron travelling with 10% of velocity of light is equal to 1) 242.4 pm 2) 24.2 pm 3) 2.42 pm 4) 0.2424 pm Q2) the number of photons of light of wavelength 7000A equivalent to 1 J are 1)3.52×10 -18 2) 3.52×10 18 3) 50000 4) 100000 | |