Search Colleges, Courses, Exams, Questions and Articles

Ask a query on 8879100846 Ask Login | Sign Up

 

 

› Ask & Answer › Question

The surface of a metal is illuminated alternately with photons of energies E? = 4eV and E? = 2.5eV respectively. The ratio of maximum speeds of the photoelectrons emitted in the two cases is 2. The work function of the metal in (eV) is 

0 4 Views | Posted a month ago
Asked by Shiksha User

  • 1 Answer

  • V

    Answered by

    Vishal Baghel | Contributor-Level 10

    a month ago

    E? = φ + K?
    E? = φ + K?
    E? - E? = K? - K?
    Now V? /V? = 2
    K? /K? = 4; K? = 4K?
    Now from equation (2)
    ⇒ 4 - 2.5 = 4K? - K?
    1.5 = 3K?
    K? = 0.5eV
    Now putting this
    Value in equation (2)
    2.5 = φ + 0.5eV
    φ = 2eV

Similar Questions for you

Maximum wavelength of light source such that photoelectron can be ejected from material of work function 3 eV is
A
alok kumar singh

Kindly go through the solution

λ = 1 2 4 0 0 3 = 4 1 3 3 . 3  Å

In a photoelectric experiment, frequency f = 1.5f0 (f0 : threshold frequency). If the frequency of light is changed to f/2, then photocurrent becomes (intensity of light has doubled)
A
alok kumar singh

Kindly go through the solution

Since f 2 < f 0  

->current = 0

A photocell works on the principle of
A
alok kumar singh

Photocell works on photoelectric effect.

The work function of a metal is w0 and l is wavelength of incident radiation. There is no emission of photoelectron when
A
alok kumar singh

For no emission of electron

λ > λ0

Q λ0 = hc/w0,  so λ > hc/w0

 

The work function of a metal is w0 and  λ is wavelength of incident radiation. There is no emission of photoelectron when
V
Vishal Baghel

For no emission of electron

λ > λ 0

? λ 0 = h c w 0 ,       s o       λ > h c w 0

 

Get authentic answers from experts, students and alumni that you won't find anywhere else

Sign Up on Shiksha

On Shiksha, get access to

  • 65k Colleges
  • 1.2k Exams
  • 687k Reviews
  • 1800k Answers

Learn more about...

Share Your College Life Experience

Write a Review

Didn't find the answer you were looking for?

Search from Shiksha's 1 lakh+ Topics

or

Ask Current Students, Alumni & our Experts

Ask Now
Community GuidelinesUser Points System
QuestionsDiscussionsTags
×
×

This website uses Cookies and related technologies for the site to function correctly and securely, improve & personalise your browsing experience, analyse traffic, and support our marketing efforts and serve the Core Purpose. By continuing to browse the site, you agree to Privacy Policy and Cookie Policy.

Need guidance on career and education? Ask our experts

Characters 0/140

The Answer must contain atleast 20 characters.

Add more details

Characters 0/300

The Answer must contain atleast 20 characters.

Keep it short & simple. Type complete word. Avoid abusive language. Next

Your Question

Edit

Add relevant tags to get quick responses. Cancel Post