Quantrex Quantrex AcademyJEE · NEET · NDA PYQs with solutions Open app
NEET 2008
Exam
NEET
Year
2008
Subject
Physics
Chapter
Dual Nature of Matter

NEET 2008 · Physics · Dual Nature of Matter

The work function of a surface of a photosensitive material is 6.2...

The work function of a surface of a photosensitive material is 6.2eV6.2 \mathrm{eV}. The wavelength of the incident radiation for which the stopping potential is 5 V5 \mathrm{~V} lies in the

Options

  1. AX-ray region
  2. BUltraviolet region
  3. CVisible region
  4. DInfrared region

Correct answer

B. Ultraviolet region

Step-by-step solution

eV0=E−ϕE=eV0+ϕ=5eV+6.2eV=11.2eV∴λ=(1240011.2)A˚=1000A˚⇒ hence lies in  ultraviolet  region . \begin{aligned}& \mathrm{eV}_{0}=E-\phi \\ & E=\mathrm{eV}_{0}+\phi \\ & =5 \mathrm{eV}+6.2 \mathrm{eV}\\ & =11.2 \mathrm{eV}\\ & \therefore \quad \lambda=\left(\frac{12400}{11.2}\right)Å=1000 Å \\ & \Rightarrow \text{ hence lies\text{ in }\text{ ultraviolet }\text{ region }. }\\ & \end{aligned}
Practice Dual Nature of Matter on Quantrex Academy →

More from Dual Nature of Matter

An electron and positron are accelerated from rest to the same kinetic energy. The ratio… MHT CET Medical 2026An electron of mass m and charge e initially at rest gets accelerated by a constant… MHT CET Medical 2026The wavelength λ_e of an electron and λ_P of a photon of same energy E are related as MHT CET Medical 2026A light of wavelength λ(λ < λ_0) falls on a metal surface. The momentum of the fastest… MHT CET Medical 2026The de Broglie wavelength of an electron with kinetic energy K_1 is λ_1 . If the kinetic… MHT CET Medical 2026A student plots two different graphs using the same photoelectric experiment data. 1.… MHT CET Medical 2026In a photoelectric cell, for the incident radiation of wavelength λ , the fastest… MHT CET Medical 2026A particle is dropped from a height ' y '. The de-Broglie wavelength of the particle as a… MHT CET Medical 2026 Full Dual Nature of Matter list All NEET PYQs