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Direction : The questions 62 and 63 are based on following paragraph : de-Broglie wave associated with electron forms a standing wave when distance (d) between atoms of the array of material is 2Å. A similar standing wave is again formed, when distance is increased to 2.5Å. Least value of distance (d) for which standing wave can be formed is |
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Answer» `0.2Å` `d=(nlambda)/(2)` `d_(1)=(nlambda)/(2),d_(2)=(n+1)lambda//2` `:. lambda//2=d_(2)-d_(1)` `rArr lambda=2(d_(2)-d_(1))` `rArr lambda=2(2.5-2)Å=1Å` `:.d_("min")=lambda//2=(1)/(2)Å=0.5Å` |
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