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  1. A parallel beam of fast moving electrons is incident normally on a narrow slit.
  2. A and B are two vectors and θ is the angle between them ,if |A x B|=√3(A.B),the value of θ
  3. A and B are two metals with threshold frequencies 1.8 x 10¹⁴ Hz and 2.2 x 10¹⁴ Hz.
  4. A circular disc of radius R is removed from a bigger circular disc of radius 2R
  5. Two identical charges repel each other with a force equal to 10 mgwt they are 0.6 m