NEET Physics EM Waves NEET PYQ-EM Waves

  • question_answer
    If \[{{\lambda }_{v}},\,{{\lambda }_{x}}\,\] and \[{{\lambda }_{m}}\] represent the wavelengths of visible light, X-rays and microwaves respectively, then:                                                                              [AIPMT (S) 2005]

    A)  \[{{\lambda }_{m}}>{{\lambda }_{x}}>{{\lambda }_{v}}\]    

    B)       \[{{\lambda }_{v}}>{{\lambda }_{m}}>{{\lambda }_{x}}\]

    C)  \[{{\lambda }_{m}}>{{\lambda }_{v}}>{{\lambda }_{x}}\]

    D)       \[{{\lambda }_{v}}>{{\lambda }_{x}}>{{\lambda }_{m}}\]

    Correct Answer: C

    Solution :

    Wavelength order of given rays are listed below:
    Rays:                            Wavelength (\[{\AA}\])
    Visible light                    4000 - 7900
    X-rays                           1 - 100
    Microwaves                    \[{{10}^{7}}-{{10}^{9}}\]
    \[{{\lambda }_{x}}<{{\lambda }_{v}}<{{\lambda }_{m}}\]
    or         \[{{\lambda }_{m}}>{{\lambda }_{v}}>{{\lambda }_{x}}\]
    Note:    Visible light, X-rays and microwaves are all electromagnetic waves.  

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