Home
Class 12
PHYSICS
Assertion : Light is produced in gases i...

Assertion : Light is produced in gases in the process of electric discharge through them at high pressure.
Reason : At high pressure electrons of gaseous atoms collide and reach excited state.

A

If both assertion and reason are true and the reason is the correct explanation of the assertion.

B

If both assertion and reason are true but reason is not the correct explanation of the assertion.

C

If assertion is true but reason is false.

D

If the assertion and reason both are false.

Text Solution

Verified by Experts

The correct Answer is:
D
Light is produced in gases in the process of electric discharge at low pressure. When accelerated electrons collide with atoms of the gas, atoms get excited. The excited atoms return to their normal state and in this process light radiations are emitted
Promotional Banner

Topper's Solved these Questions

  • ELECTRON, PHOTON, PHOTOELECTRIC EFFECT & X -RAY

    ERRORLESS|Exercise PAST YEARS QUESTIONS|71 Videos

  • ELECTROMAGNETIC INDUCTION

    ERRORLESS|Exercise ASSERTION & REASON|20 Videos

  • ELECTRONICS

    ERRORLESS|Exercise Assertion & Reason|26 Videos

Similar Questions

Explore conceptually related problems

Assertion : Light is produced in gases in the process of electric discharge through them at high pressure. Reason : At high pressure electrons of gaseous atoms collide and reach and excited state.

In the phenomenon of electric discharge through gases at low pressure , the coloured glow in the tube appears as a result of

Assertion: The solubility of gases always increases with increase in pressure. Reason: High pressure favours the change where volume decreases.

State one condition necessary to liquefy gases (other than applying high pressure)

Assertion: When a real gas is allowed to expand adiabatically through a fine hole from a region of high presssure to a region of low pressure, the temperature of gas falls in a completely insulated container. Reason: Work is done at the cost of internal energy of the gas.

Assertion : At high altitudes liquids boil at lower temperaturers in comparison to that of sea level. Reason : At high altitudes atmospheric pressure is low

ERRORLESS-ELECTRON, PHOTON, PHOTOELECTRIC EFFECT & X -RAY-ASSERTION & REASON
  1. Assertion : The specific charge of positive rays is not constant. Re...

    Text Solution

    |

  2. Assertion : Photosensitivity of a metal is high if its work function i...

    Text Solution

    |

  3. Assertion : The de - Broglie wavelength of a molecule varies inversely...

    Text Solution

    |

  4. Assertion : An electron is not deflected on passing through certain re...

    Text Solution

    |

  5. Assertion : Electric conduction in gases is possible at normal pressur...

    Text Solution

    |

  6. Assertion : Light is produced in gases in the process of electric disc...

    Text Solution

    |

  7. Assertion : The photoelectrons produced by a monochromatic light beam ...

    Text Solution

    |

  8. Assertion : An electric field is preferred in comparison to magnetic f...

    Text Solution

    |

  9. Assertion : The specific charge for positive rays is a characteristic ...

    Text Solution

    |

  10. Assertion : In Millikan's experiment for the determination of charge o...

    Text Solution

    |

  11. Assertion : In the process of photoelectric emission , all the emitted...

    Text Solution

    |

  12. Assertion : In photoelctric effect , on increasing the intensity of li...

    Text Solution

    |

  13. Assertion : Standard optical diffraction gratings cannot be used for ...

    Text Solution

    |

  14. Assertion : The threshold frequency of photoelectric effect supports t...

    Text Solution

    |

  15. Assertion : In photoemissive cell inert gas is used. Reason : Inert ...

    Text Solution

    |

  16. Assertion : X - rays cannot be diffracted by means of grating . Reas...

    Text Solution

    |

  17. Assertion : X - rays can penetrate through the flesh but not through t...

    Text Solution

    |

  18. Assertion : Intensity of X - rays can be controlled by adjusting the f...

    Text Solution

    |

  19. Assertion : Soft and hard X-rays differ in frequency as well as veloci...

    Text Solution

    |

  20. Assertion : Penetrating power of X-rays increases with the increasing ...

    Text Solution

    |