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A photon of energy 2.5 eV and wavelength...

A photon of energy `2.5 eV` and wavelength `lambda` falls on a metal surface and the ejected electron have velocity `'v'`. If the `lambda` of the incident light is decreased by `20%` the maximum velocity of the emitted electrons is doubled. The work function of the metal is

A

2.6 eV

B

2.23 eV

C

2.5 eV

D

2.29 eV

Text Solution

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The correct Answer is:
4
`(v_(1)^(2))/(v_(2)^(2))=((hc)/((lambda_(1)))-omega)/((hc)/lambda_(2)-omega)use E=(12400)/(lambda(A^(0)))`
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NARAYNA-DUAL NATURE OF RADIATION AND MATTER-EXERCISE - 4
  1. An electron (mass m) with an initial velocity vecv=v(0)hati is in an e...

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  2. When a surface 1 cm thick is illuminated with light of wavelength lamb...

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  3. A photon of energy 2.5 eV and wavelength lambda falls on a metal surfa...

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  4. A source of light is placed above a sphere of radius 10cm. How many ph...

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  5. From the above figure the values of stopping potentials for M(1) and M...

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  6. For certain photosensitive material, a stopping potential of 3.0 V is ...

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  7. Light of wavelength 180 nm ejects photoelectrons from a plate of met...

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  8. Light described at a place by the equation E = (100V//m) xx [sin (5 xx...

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  9. The electric field associated with a light wave is given by E=E(0)sin[...

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  10. An electron of mass m and charge e initially at rest gets accelerated ...

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  11. A praticle of mass M at rest decays into two particle of masses m1 and...

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  12. A photon and an electron have equal energy E . lambda("photon")//lambd...

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  13. When a monochromatic point source of light is at a distance of 0.2 m...

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  14. An X-ray tube is operated at 50 kV and 20 m A. The target material of ...

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  15. The potential energy of a particle of mass m is given by V(x) = E0 w...

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  16. According to Einstein's photoelectric equation , the graph between the...

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  17. Which of the following figure represents the variation of particle mom...

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  18. The de Broglie wave present in fifth Bohr orbit is:

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  19. The graph shown in figure show the variation of photoelectric current ...

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  20. The anode voltage of photocellis kept fixed. The wavelength lambda of ...

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