Quantrex Quantrex AcademyJEE · NEET · NDA PYQs with solutions Open app
JEE Advanced 2015Paper 1
Exam
JEE Advanced
Year
2015
Paper
Paper 1
Subject
Physics
Chapter
Dual Nature of Matter

JEE Advanced 2015 · Paper 1 · Physics · Dual Nature of Matter

Consider a hydrogen atom with its electron in the n ^ th orbital....

Consider a hydrogen atom with its electron in the nth{n}^{th} orbital. An electromagnetic radiation of wavelength 90 nm is used to ionize the atom. If the kinetic energy of the ejected electron is 10.4 eV, then the value of n is (hc=1242eVnm)\left(hc = 1242eVnm\right)Consider a hydrogen atom with its electron in the n ^ th orbital. An electromagnetic radiation of wavelength 90 nm is

Correct answer

0

Step-by-step solution


Consider a hydrogen atom with its electron in the n ^ th orbital. An electromagnetic radiation of wavelength 90 nm is
EPh=hcλ=124290=13.8eV{E}_{Ph} = \dfrac{hc}{\lambda} = \dfrac{1242}{90} = 13.8eV
EPh=∆E+(K.E.){E}_{Ph} = ∆ E + ( K . E . )
13.8=∆E+10.413.8 = ∆ E + 10.4
∆E=3.4eV∆ E = 3.4eV
So electron initially was in n=2n = 2
Practice Dual Nature of Matter on Quantrex Academy →

More from Dual Nature of Matter

K_1 and K_2 be the maximum kinetic energies of photoelectrons emitted from a surface of a… JEE Main 2026The de Broglie wavelength for an electron accelerated through the potential difference of… JEE Main 2026Given below are two statements: one is labelled as Assertion (A) and the other is… JEE Main 2026An electron is travelling with a velocity v in free space and when it enters a medium… JEE Main 2026An electron of mass m is moving in an electric field E = -2E_0 i ( E_0 = constant > 0 )… JEE Main 2026Light source having wavelength 331 nm is used to generate photo-electrons whose stopping… JEE Main 2026Match the LIST-I with LIST-II List-I List-II A. Planck's constant I. ML^2T^ -2 B.… JEE Main 2026The de Broglie wavelength associated with an electron accelerated through a potential… JEE Main 2026 Full Dual Nature of Matter list All JEE Advanced PYQs