Chemistry · Structure of Atom
JEE Main 2025 — 7 April, Morning Shift — Question 15
Which of the following statements are correct, if the threshold frequency of caesium is ?
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:
- Option A:
A, C, D and E Only
- Option B:Correct
A, B, D and E Only
- Option C:
A, D and E Only
- Option D:
B, C and D Only
Answer: B
Step-by-step solution
Where Cs is irradiated it shows photo electric effect. Red light ( ) has lesser than yellow
(570-590nm)
Answer key and solution verified before publishing.
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- Exam
- JEE Main 2025
- Subject
- Chemistry
- Chapter
- Structure of Atom
- Topic
- Photoelectric Effect and Planck's Quantum Theory