Home
Class 12
PHYSICS
A : infrared waves are often called heat...

A : infrared waves are often called heat waves.
R : Infrared waves vibrate not only the electrons, but entire atoms or molecules of a substance which increases the internal energy and temperature of the substance.

A

If both Assertion & Reason are true and the reason is the correct explanation of the assertion, then mark (1)

B

If both Assertion & Reason are true but the reason is not the correct explanation of the assertion, then mark (2)

C

If assertion is true statement but Reason is false, then mark (3)

D

If both Assertion and Reason are false statements, then mark (4)

Text Solution

Verified by Experts

The correct Answer is:
A
Promotional Banner

Topper's Solved these Questions

  • ELECTROMAGNETIC WAVES

    AAKASH INSTITUTE ENGLISH|Exercise ASSIGNMENT SECTION - C Previous Years Questions|22 Videos

  • ELECTROMAGNETIC INDUCTION

    AAKASH INSTITUTE ENGLISH|Exercise ASSIGNMENT(SECTION -D) Assertion-Reason type Question)|15 Videos

  • ELECTROSTATIC POTENTIAL AND CAPACITANCE

    AAKASH INSTITUTE ENGLISH|Exercise ASSIGNMENT SECTION - D|9 Videos

Similar Questions

Explore conceptually related problems

STATEMENT-1 : Infra-red waves are caleld heat-waves. STATEMENT-2 : Infra-red waves cause the vibration of not only electrons, but entiie or moelcules of a substance.

Which form of energy do the molecules of a substance gain when it is heated?

Wave functions of electrons in atoms and molecules are called …………..

How does the (a) average kinetic energy (b) average potential energy of molecules of a substance change during its change in phase at a constant temperature, on heating ?

Wave functions of electrons in atoms and molecules are called...............

(a) Why are infrared waves often called heat waves? Explain. (b) What do you understand by the statement, "Electromagnetic waves transport momentum"?

How are infrared waves produced? Why are these referred to as 'heat waves'? Write their one improtant use.

A: The internal energy of a solid substance increases during melting. R: Latent heat is required to melt a solid substance.

As the temperature of a substance increases, its molecules move faster and thus the kinetic energy of the molecules increases.

Name the energy which arises due to motion of atoms of molecules in a body. How is this energy effected when the temperature is increased ?

AAKASH INSTITUTE ENGLISH-ELECTROMAGNETIC WAVES-ASSIGNMENT SECTION - D Assertion-Reason Type Questions
  1. A : All electromagnetic waves travel through vacuum with same speed bu...

    Text Solution

    |

  2. A : High frequency electromagnetic waves are detected by some means ba...

    Text Solution

    |

  3. A : infrared waves are often called heat waves. R : Infrared waves v...

    Text Solution

    |

  4. A : The centre of sensitivity of our eyes coincides with the centre of...

    Text Solution

    |

  5. A : Long distance radio broadcasts use short-wave bands. R : Ionosp...

    Text Solution

    |

  6. A : It is necessary to use satellites for long distance TV transmissi...

    Text Solution

    |

  7. A : Optical and radio telescopes are built on the ground but X-ray ...

    Text Solution

    |

  8. A : If the earth did not have an atmosphere, its average surface temp...

    Text Solution

    |

  9. A : It has been predicted that a global nuclear war on the earth would...

    Text Solution

    |

  10. A : In an EM wave the magnitude of the electric field vector is more ...

    Text Solution

    |

  11. A : The displacement current goes through the gap between the plates...

    Text Solution

    |

  12. As the frequency of an ac circuit increases, the current first increas...

    Text Solution

    |

  13. A : When cooking in microwave ovens, metal containers are used. R :...

    Text Solution

    |

  14. A : Food is cooked faster by microwaves than by conventional gas burne...

    Text Solution

    |

  15. A : Microwaves are commonly used in radar to locate flying objects. ...

    Text Solution

    |

  16. A : Environmental damage has depleted the ozone layer in the atmosphe...

    Text Solution

    |

  17. A: The electrical. Conductivity of the Earth's atmosphere does not cha...

    Text Solution

    |

  18. A : Static crashes are heard on a radio when a lightening flash occurs...

    Text Solution

    |

  19. A : TV signals are affected if a low flying aircraft passes by or a p...

    Text Solution

    |

  20. A : Light waves can be polarised. R : All electromagnetic waves move...

    Text Solution

    |