Consider a metal exposed to light of wavelength 600 nm. The maximum energy of the electron doubles when light of wavelength 400 nm is used. Find the work function in eV.

 

0 5 Views | Posted 3 months ago
Asked by Shiksha User

  • 1 Answer

  • A

    Answered by

    alok kumar singh | Contributor-Level 10

    3 months ago

    This is a Short Answer Type Questions as classified in NCERT Exemplar

    Explanation- During photoelectric emission, the momentum of incident photon is transferred to the metal. At microscopic level, atoms of a metal absorb the photon and its momentum is transferred mainly to the nucleus and electrons.

    The excited electron is emitted. Therefore, the conservation of momentum is to be Considered as the momentum of incident photon transferred to the nucleus and electrons.

     

Similar Questions for you

R
Raj Pandey

Based on theory

V
Vishal Baghel

z² × (13.6) (1 - ¼) = 3 × (13.6)
z = 2 . (i)
h/√2mk? = (1/2.3) × h/√2mk?
=> k? = (2.3)²k? = 5.25k? (ii)
Now, k? = E? - Φ
k? = E? - Φ = z²E? - Φ
∴ k? /k? = (10.2 - Φ)/ (4 × 10.2 - Φ) = 1/5.25
=> Φ = 3eV

V
Vishal Baghel

  K . E 1 = 1 2 3 0 8 0 0 ? - (i)

  K . E 2 = 2 K . E 1 = 1 2 3 0 5 0 0 ? - (ii)

from (i) & (ii)

? = 0 . 6 1 5  ev

V
Vishal Baghel

hu = hu0 + K.E

Cases u = 2u0

h2u0 = hu0 + K.E1

K.E1 = hu0

1 2 m v 1 2 = h υ 0

v 1 2 = 2 h υ 0 m  

v 1 = 2 h υ 0 m - (1)      

Now, cases 2

h 5u0 = hu0 + k.E2

k.E2 = 4hu0

1 2 m v 2 2 = 4 h υ 0

v2 =     8 h υ 0 m   - (2)

v 2 v 1 = 8 2 = 2          

v2 = 2v1

A
alok kumar singh

This is a Short Answer Type Questions as classified in NCERT Exemplar

Sol:

f(x)=2x23x2x2=2x24x+x2x2=2x(x2)+1(x2)x2=(2x+1)(x2)x2=2x+1limx2f(x)=2x+1=limh02(2h)+1=4+1=5limx2+f(x)=2x+1=limh02(2+h)+1=4+1=5limx2f(x)=5Aslimx2f(x)=limx2+f(x)=limx2f(x)=5Hence,f(x)iscontinuousatx=2.

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
  • 688k Reviews
  • 1800k Answers

Learn more about...

Share Your College Life Experience

Didn't find the answer you were looking for?

Search from Shiksha's 1 lakh+ Topics

or

Ask Current Students, Alumni & our Experts

×
×

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