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  1. The de-Broglie wavelength of an electron moving with a velocity 1.5×10⁸ ms⁻¹ is equal
  2. Electrons in the atom are held to the nucleus by
  3. A projectile is thrown in the upward direction making an angle of 60°with the horizontal
  4. A lead bullet of 10 gm travelling at 300 m/s strikes against a block
  5. The reddish appearance of the sun at sunrise and sunset is due to