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How are microwaves produced ? Why is it ...

How are microwaves produced ? Why is it necessary in microwave ovens to select the frequency of microwaves to match the resonant frequency of water molecules ?

Text Solution

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Microwaves are produced by special vacuum tubes like the klystron, / Magnetron / Gunn diode.
The frequency of microwaves is selected to match the resonant frequency of water molecules, so that energy is transferred efficiently to the kinetic energy of the molecules.
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Knowledge Check

  • Microwaves are electromagnetic waves with frequency, in the range of

    A
    micro hertz
    B
    mega hertz
    C
    giga hertz
    D
    hertz

  • Statement -I : When we statrt filling the empty bucket with water, then the pitch of sound waves produced keeps on decreasing Statement-II : The frequency of boy's voice is usually greater than that of girls's voice.

    A
    Statement -I is true, Statement -II is true and
    Statement -I is correct explanation for Statement -II.
    B
    Statement-I is true, Statement-II is true and
    Statement -II is not correct explanation of Statement-I.
    C
    Statement-I is true, Statement-II is false and
    D
    Statement-I is false, Statement-II is false.

  • How many ions per molecule are produced in the solution when Mohr salt is dissolved in excess of water?

    A
    6
    B
    4
    C
    10
    D
    5

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    Arrange the follwing electromagnetic radiations in ascending order to their frequencies: (i) Microwaves (ii) Radio waves (iii) X-rays (iv) Gamma rays Write two uses of any one of these.

    How many ions molecule are produced in the solution when mohr salt is dissolved in excess of water?

    How many ions per molecule are produced in the solution when Mohr salt is dissolved in excess of water ?

    A hollow metallic tube a length L and closed at one end produces resonance with a tuning fork of frequency n. The entire tube is then heated carefully. So that at equilibrium temperature its length changes by l . If the change in velocity V of sound is v, the resonance will now be produced by tuning fork whose frequency is :

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