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QJEEM23Ph5daf: JEE Main 2023 Physics - Class 12 JEEM23Ph5daf Solution: The threshold wavelength for photoelectric emission from a…

The threshold wavelength for photoelectric emission from a material is 5500 Ao\mathop A\limits^o . Photoelectrons will be emitted, when this material is illuminated with monochromatic radiation from a

A. 75 W infra-red lamp

B. 10 W infra-red lamp

C. 75 W ultra-violet lamp

D. 10 W ultra-violet lamp

Choose the correct answer from the options given below :

Multiple Choice Options

  • A C only
  • B A and D only
  • C C and D only
  • D B and C only

Step-by-Step Verified Solution

Wavelength of infra-red =700 nm=700 \mathrm{~nm} (minimum)

Wavelength of UV =100−400 nm=100-400 \mathrm{~nm}

Since we need \lambda<5000 Å

⇒\Rightarrow Only UV would be able to emit photoelectrons.

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