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JEE Main20257 Apr 2025Morning ShiftChemistryStructure of AtomActual

Which of the following statements are correct, if the threshold frequency of caesium is 5.16 10¹⁴ ~Hz ? A. When Cs is placed inside a vacuum chamber with an ammeter connected to it and yellow light is focused on Cs the ammeter shows the presence of current. B. When the brightness of the yellow light is dimmed, the value of the current in the ammeter is reduced. C. When a red light is used instead to the yellow light,

Options

  1. AA, D and E Only
  2. BB, C and D Only
  3. CA, C, D and E Only
  4. DA, B, D and E Only

Correct answer

D. A, B, D and E Only

Step-by-step solution

aligned & = C v = 3 10 5.16 10¹⁴ & =581.39 ~nm aligned * _ Photon is near & below yellow light it can show photoelectric effect. * If intensity of light decreases photocurrent decreases. * Red light will not produce photoelectric effect. * v_ Blue v_ yellow so photoelectric current will be produced. * White light contain all frequencies so it will show photo electric current. Correct statements are ~A~B~D~ & ~E .

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