Quantrex Quantrex AcademyJEE · NEET · NDA PYQs with solutions Open app
NEETChemistryStructure of Atom

When electromagnetic radiation of wavelength 300 nm falls on the surface of sodium, electrons are emitted with a kinetic energy of 1.68 ×10 5 J mol –1 . (i) What is the minimum energy needed to remove an electron from sodium? and (ii) What is the maximum wavelength that will cause a photoelectron to be emitted?

Options

  1. A(i) 3.84×10 –19 J and (ii) 517 nm
  2. B(i) 4.54×10 –19 J and (ii) 634 nm
  3. C(i) 5.67×10 –19 J and (ii) 428 nm
  4. D(i) 3.84×10 –19 J and (ii) 239 nm

Correct answer

A. (i) 3.84×10 –19 J and (ii) 517 nm

Step-by-step solution

Correct Option is : (A) (i) 3.84×10 –19 J and (ii) 517 nm

Practice Structure of Atom on Quantrex Academy →

More from Structure of Atom

Identify the pair of atoms of elements as isotones from the following. 2026Which of the following elements has an electronic configuration, [ Ar ] 4s^2 ? 2026Calculate the energy per mole of photons of red light with a wavelength 750 nm. [ h = 6.626 10⁻³⁴ Js, C = 3 10^8 m/s.] 2026Calculate the energy associated with an electron in the first orbit of hydrogen atom? 2026Find the wave number of the 4^ th line in the Lyman series of H spectrum. (R = Rydberg constant) 2026Calculate the de-Broglie wavelength of an electron having velocity 1000 ms ⁻¹ [ h = 6.626 10⁻³⁴ js , mass of an electron = 9.1 10⁻³¹ kg ] 2026How many total number of s and p electrons are respectively present in Cl ^- ? 2026Visible light has a wavelength of 700 nm. Calculate its frequency in hertz. 2026 Full Structure of Atom list All NEET PYQs