Which of the following statements are correct, if the threshold frequency of caesium is Hz?

A. When Cs is placed inside a vacuum chamber with an ammeter connected to it and yellow light is focused o

Question

Which of the following statements are correct, if the threshold frequency of caesium is  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 of the yellow light, the current produced is higher with respect to the yellow light.

D. When a blue light is used, the ammeter shows the formation of current.

E. When a white light is used, the ammeter shows formation of current.

Choose the correct answer from the options given below:

Canvas Classes · Accepted Answer

Step 1: Find threshold wavelength

Hz

nm (yellow-green region)

Step 2: Evaluate each statement

A. Yellow light ( nm,  Hz) — near threshold. Yellow light frequency  → photoelectric effect occurs → current flows. ✓ TRUE

B. Dimming reduces intensity (fewer photons) → fewer electrons ejected → current decreases. ✓ TRUE

C. Red light ( nm,  Hz) — below threshold → no photoelectric effect → no current at all. ✗ FALSE

D. Blue light ( nm,  Hz) — above threshold → photoelectric effect → current fl

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