Home
Class 11
CHEMISTRY
When electromagnetic radiation of wavele...

When electromagnetic radiation of wavelength 300 nm falls on the surface of sodium, electrons are emitted with kinetic energy of `1.68 xx 10^(5) J "ml"^(-1)`. What is the minimum energy needed to remove an electron from sodium ? What is the maximum wavelength that will cause a photoelectron to be emitted.

A

51.7 nm

B

517 nm

C

427 nm

D

62 nm

Text Solution

Verified by Experts

The correct Answer is:
B
`hv = W + K. E, w = (hc)/(lambda) - K. E`
`W = (hc)/(lambda_0) rArr lambda_0 = (hc)/(W)`
Promotional Banner

Topper's Solved these Questions

  • STRUCTURE OF ATOM

    NARAYNA|Exercise EXERCISE - IV H-SPECTRUM|7 Videos

  • STRUCTURE OF ATOM

    NARAYNA|Exercise EXERCISE - IV BOHR.S ATOMIC MODEL|4 Videos

  • STRUCTURE OF ATOM

    NARAYNA|Exercise EXERCISE - IV ELECTROMAGNETIC RADIATION|12 Videos

  • STATES OF MATTER

    NARAYNA|Exercise A & R TYPE QUESTIONS|16 Videos

  • THERMODYNAMICS

    NARAYNA|Exercise Assertion- Reason|5 Videos

Similar Questions

Explore conceptually related problems

When electromagnetic radiaiton of wavelength 300 nm falls on the surface of sodium electrons are emitted with a kinetic enegry of 1.68xx10^(5)Jmol^(-) . What is the minimum enegry needed to remove an electorn from sodium? Strategy: The minimum enegry required to remove an electron from target metal is called work function W_(0) of the metal. It can be calculated from Eq., provided we know the energy of the incident photon and kinetic enegry of a single photoelectorn.

When light of 470 nm falls on the surface of potassium metal, electrons are emitted with a velocity of 6.4 xx 10^(4)ms^(-1) . What is the minimum energy required to remove one moles electrons from potassium metal?

Electromagnetic radiation of wavelength 242 nm is just sufficient to ionise the sodium atom . Calculate the ionisation energy of sodium in kJ mol^(-1) .

A beam of light of wavelength lambda and with illumination L falls on a clean surface of sodium . If N photoelectrons are emitted each with kinetic energy E , then

An electron is moving with a kinetic energy of 4.55 xx 10^-25 J . What will be Broglie wavelength for this electron ?

When a radiation of energy 5eV falls on a surface,the emitted photoelectrons have a maximum kinetic energy of 3eV .The stopping potential is