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

The power and wavelength emitted by a laser pointer commonly used in Power Point presentations are 1.0 mW and 670 nm respectively. Number of photons emitted by this pointer during a presentation of 5 minutes is

Options

  1. A1.01 10^9
  2. B1.01 10²¹
  3. C1.6 10¹⁶
  4. D1.01 10¹⁸

Correct answer

D. 1.01 10¹⁸

Step-by-step solution

No Solution

Practice Structure of Atom on Quantrex Academy →

More from Structure of Atom

If the radius of the hydrogen atom is 53 pm , the radius of the He ⁺ ion is close toAn electron present in the third excited state of a H atom returns to the first excited state and then to the ground state. If ₁ and ₂ are the wavelengths of light emitted in theseThe ratio of the energy of the electron in ground state of hydrogen atom to that of the electron in the first excited state of Be ³⁺ isWhen a certain metal was irradiated with light of frequency 3.2 10¹⁶ ~Hz , the photoelectrons emitted had twice the kinetic energy as did the photoelectrons emitted when the same mAn orbital among the following that has two radial nodes and two angular nodes isDecay of radioisotopes follows first order kinetics. Radioisotope U²³⁸ undergoes decay to a stable isotope, Th ²³⁴ . The ratio of the number of atoms of U ²³⁸ to that of Th ²³⁴ aftFor which of the following processes, carried out in free space, energy will be absorbed? I. Separating an electron from an electron II. Removing an electron from a neutral atom IIWhich of the following elements will exhibit photoelectric effect with light of the longest wavelength? Full Structure of Atom list All Olympiad workbook PYQs