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The de-Broglie wavelength of an electron is the same as that of a photon. If velocity of electron is 25% of the velocity of light, then the ratio of K.E. of electron and K.E. of photon will be:
1)1/1. 2)1/8. 3) 8/1. 4)1/4
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![Four point charges, each of +q, are rigidly fixed at the four corners of a square planar soap film of side βaβ. the surface tension of the soap film is Ξ³. The system of charges and planar film are in equilibrium, and a=k[q2Ξ³]1N, where βkβ is a constant. Then N is: 9 Four point charges, each of +q, are rigidly fixed at the four corners of a square planar soap film of side βaβ. the surface tension of the soap film is Ξ³. The system of charges and planar film are in equilibrium, and a=k[q2Ξ³]1N, where βkβ is a constant. Then N is:](https://physicsmonk.com/wp-content/uploads/2025/04/youtube-UhrMtwn3AMQ-1744400759-300x225.jpg)



