Home
Class 12
PHYSICS
Assertion : A laser beam 0.2 W power can...

Assertion : A laser beam `0.2 W` power can drill holes through a metal sheet, whereas `1000 W` torch-light cannot.
Reason : The frequency of laser light is much higher than that of torch light.

A

Statement-1 is true, Statement-2 is true and Statement-2 is correct explanation of Statement-1.

B

Statement-1 is true, Statement-2 is true, but Statement-2 is not a correct explanation of Statement-1.

C

Statement-1 is true, but Statement-2 is false

D

Statement-1 is false, but Statement-2 is true.

Text Solution

Verified by Experts

The correct Answer is:
c
Energy per sec per unit area of laser beam is very high than that of torch light, though the frequency of the two may be the same.
Promotional Banner

Topper's Solved these Questions

  • DUAL NATURE OF RADIATION AND MATTER

    PRADEEP|Exercise Value based question|1 Videos

  • CURRENT ELECTRICITY

    PRADEEP|Exercise Problems for Practice (B)|2 Videos

  • ELECTROMAGNETIC INDUCTION & ALTERNATING CURRENT

    PRADEEP|Exercise Multiple Choice Questions|1 Videos

Similar Questions

Explore conceptually related problems

Assertion : The threshold frequency of photoelectric effect supports the particle nature of light. Reason : If frequency of incident light is less than the threshold frequency, electrons are not emitted from metal surface.

Assertion : The threshold frequency of photoelectric effect supports the particle nature of sunlight . Reason : If frequency of incident light is less than the threshold frequency , electrons are not emitted from metal surface.

Assertion : The number of electrons ejected from a metal surface depend upon the frequency of light. Reason : There is a time lag between the striking of light beam and the ejection of electrons from the metal surface.

Assertion: In series combination of electric bulbs th ebulb of lower power emits more light than that of higher power bulb. Reason: The lower power bulb in series gets more current than the higher power bulb.

Assertion : A beam of white light when passed through a hollow prism cannot give spectrum. Reason : Because refractive index of air inside and outside the prism is same so no refraction and hence no deviation wll take place.

Assertion : Sound waves cannot propagate through vacuum but light waves can. Reason : Sound waves cannot be polarised but light waves can.

Assertion: Photoelectric effect proves the particle nature of light. Reason: Photoemission starts as soon as light is incident on the metal surface, provided frequency of incident light is greater than or equal to the threshold frequency.

Given below are two statements : one is labelled as Assertion A and the other is labelled as Assertion A: An electron microscope can achieve better resolving power than an optical microscope. Reason R : The de Broglie's wavelength of the electrons emitted from an electron gun is much less than wavelength of visible light. In the light of the above statements, choose the correct answer from the options given below:

PRADEEP-DUAL NATURE OF RADIATION AND MATTER-Exercise
  1. The work function of Silver and sodium are 4.6 and 2.3 eV, respective...

    Text Solution

    |

  2. A 25 watt bulb, which is producing monochromatic light of wavelength 6...

    Text Solution

    |

  3. A parallel beam of monochromatic light of wavelength 600nm is incident...

    Text Solution

    |

  4. A proton is fired from very far away towards a nucleus with charge Q ...

    Text Solution

    |

  5. De-broglie wavelength associated with an electron accelerated through ...

    Text Solution

    |

  6. Find the energy that should be added to an electron of energy 2eV to r...

    Text Solution

    |

  7. Assertion: Light of frequency 1.5 times the threshold frequency is inc...

    Text Solution

    |

  8. Assertion : Photoelectric effect demonstrates the wave nature of light...

    Text Solution

    |

  9. Assertion: Photoecell is called electric eye. Reason: Photocell can ...

    Text Solution

    |

  10. Assertion: An electron microscop can achieve better resolving power th...

    Text Solution

    |

  11. Assertiom: The de-broglie wavelength of a neutrons when its kinetic en...

    Text Solution

    |

  12. Assertion: The de-broglie wavelength equation has significance for any...

    Text Solution

    |

  13. Assertion: A particle of mass M at rest decays into two particles of m...

    Text Solution

    |

  14. Statement-1: The photoelectrons produced by a monochromatic light beam...

    Text Solution

    |

  15. This question has statement - 1 and statement - 2 of the four choice g...

    Text Solution

    |

  16. Statement - 1 : When ultraviolet light is incident on a photocell , it...

    Text Solution

    |

  17. Assertion : A laser beam 0.2 W power can drill holes through a metal s...

    Text Solution

    |

  18. Statement-1: A small metal ball is suspended in a uniform electric fie...

    Text Solution

    |

  19. Statement-1: An electron of mass m when accelerated through a potentia...

    Text Solution

    |

  20. Statement-1: Davisson-Germer experiment established the wave nature of...

    Text Solution

    |