Home
Class 12
PHYSICS
A light source emit monochromatic light ...

A light source emit monochromatic light of 5000 Å wavelength and produce 5 W power .When it is displaced by 0.5 m from photo sensitive surface photoelectron are emitted,when distance increased by 0.5, no.of photoelectron liberated will become ……

A

8

B

16

C

2

D

4

Text Solution

Verified by Experts

The correct Answer is:
D
No. of electron emitted
`N_(E)prop "intensity"prop (1)/(("distance ")^(2))`
`therefore` When distance become double `N_(E)` will decrease `(1)/(4)` times.
Promotional Banner

Topper's Solved these Questions

  • DUAL NATURE OF RADIATION AND MATTER

    KUMAR PRAKASHAN|Exercise Section-D (MCQs asked in CBSE-PMT,AIPMT,NEET)|1 Videos

  • DUAL NATURE OF RADIATION AND MATTER

    KUMAR PRAKASHAN|Exercise Section-D (MCQs asked in AIIMS)|55 Videos

  • DUAL NATURE OF RADIATION AND MATTER

    KUMAR PRAKASHAN|Exercise Section-D (MCQ based on Textual Illustrations and Exercise)|1 Videos

  • CURRENT ELECTRICITY

    KUMAR PRAKASHAN|Exercise SECTION [D] MULTIPLE CHOICE QUESTIONS (MCQs) (MCQs ASKED IN BOARD EXAM AND GUJCET)|23 Videos

  • ELECTRIC CHARGES AND FIELDS

    KUMAR PRAKASHAN|Exercise SECTION D MCQS ASKED IN COMPETITIVE EXAMES (MCQS AKSED IN BOARD EXAM AND GUJCET)|14 Videos

Similar Questions

Explore conceptually related problems

A photocell is placed at 1 m distance from light source when distance is changed to (1)/(2) m no.of photoelectron emitted from cathode will come

When photon of v frequency os incident on photo sensitive surface with V_(0) threshold frequency,maximum kinetic energy of photo-electron emitted will be….

A laser emit monochromatic light of 6.0xx10^(14)Hz frequency and produce power of 2xx10^(-3) W.No of photon produced per second will be…..

Monochromatic light frequency 5.0xx10^(14) Hz is produced by a laser.The power emitted is 66 W. How many photons per second,on an average ,are emitted by the source?

A 25 watt bulb emits monochromatic yellow light of wavelength of 0.57 mu m .Calculate the rate of emission of quanta per second .

Monochromatic radiation of wavelength lambda_(1) = 3000 Å falls on a photocell operating in saturating mode. The correspondin spectral sensitivity of photocell is J = 4.8 xx 10^(-3) A//W . When another monochromatic radiation of wavelength lambda_(2) = 1650 Å and power P = 5 xx 10^(-3) W is incident, it is found that maximum velocity of photoelectrons increases n = 2 times. Assuming efficiency of photoelectron generation per incident photon to be same for both the cases, calculate (i) threshold wavelength for the cell. (ii) saturation current in second case.

For photosensitive surface threshold wavelength is 5200Å .When monochromatic radiation of ……is incident on this surface,photoelectron will be emitted.

Speed of light wave of 5000 Å wavelength produced from a star is 1.5 xx 10^(6) m//s , then change in wavelength when it reaches to Earth is ......

Two point source separated by d=5mum emit light of wavelength lamda=2mum in phase A cicular wire of radius 20mum is placed around the source as shown in figure.

KUMAR PRAKASHAN-DUAL NATURE OF RADIATION AND MATTER-Section-D (MCQs asked in competitve exams)
  1. Momentum of photon having 1 MeV energy is

    Text Solution

    |

  2. A laser emit monochromatic light of 6.0xx10^(14)Hz frequency and produ...

    Text Solution

    |

  3. A light source emit monochromatic light of 5000 Å wavelength and prod...

    Text Solution

    |

  4. Energy corresponding to threshold frequency of metal is 6.2 eV.For giv...

    Text Solution

    |

  5. Colour in discharge tube filled with gas at low pressure is due to …

    Text Solution

    |

  6. Find velocity of particle with 1 mg mass and having same wavelength th...

    Text Solution

    |

  7. No . Of photoelectron emited by light with frequency f is proportional...

    Text Solution

    |

  8. helium-Neon laser emit monochromatic light of 667 nm abd produce power...

    Text Solution

    |

  9. In given region electric and magnetic field are prpendicular to each o...

    Text Solution

    |

  10. A source S(1) produces 10^(15) photon every second having wavelength o...

    Text Solution

    |

  11. Ultraviolet light of 200 nm wavelength is incident on nickel surface h...

    Text Solution

    |

  12. In Davisson-Germer experiment in order to increase velocity of electro...

    Text Solution

    |

  13. In electron microscope 25 kV voltage is used to accelerate electron .B...

    Text Solution

    |

  14. The threshold frequency for a certain metal is 3.3xx10^(14) Hz.If ligh...

    Text Solution

    |

  15. For photoelectric emission from certain metal the cutoff fequency is v...

    Text Solution

    |

  16. The wavelength lambda(e) of an electron and lambda(P) of a photon of s...

    Text Solution

    |

  17. When the energy of the incident radiation is increased by 20% ,the kin...

    Text Solution

    |

  18. A certain metallic surface is illuminated with monochromatic light of ...

    Text Solution

    |

  19. Light of wavelength 500 nm is incident on a metal with work functin 2....

    Text Solution

    |

  20. A photoelectric surface is illuminated successively by monochromatic l...

    Text Solution

    |