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    831.

    Electromagnetic waves travel in a medium which has relative permeability 1.3 and relative permittivity 2.14. Then the speed of the electromagnetic wave in the medium will be

    A

    13.6imes10  6m/s13.6 imes {10^{\;6}}m/s

    B

    1.8imes102  m/s1.8 imes {10^2}\;m/s

    C

    3.6imes108 m/s3.6 imes {10^8}\,m/s

    D

    1.8imes108  m/s1.8 imes {10^8}\;m/s

    Question Tags

    📚 Subject:Physics
    📑 Chapter:Electromagnetic Waves
    🎯Topic:Electromagnetic Spectrum
    🎓 Ncert Level:Application
    🎯Difficulty :Medium
    ⚡ Time Required :2 mins
    🔄Ncert Concepts :electromagnetic waves, speed of light in a medium, relative permeability, relative permittivity
    832.

    A plane electromagnetic wave travelling along the XX-direction has a wavelength of 3  mm3\;mm. The variation in the electric field occurs in the YY-direction with an amplitude 66  Vm−166\;V{m^{ - 1}}. The equations for the electric and magnetic fields as a function of x  and  tx\;and\;t are respectively

    A

    Ey=33cos⁡πimes1011(t−xc){E_y} = 33\cos \pi imes {10^{11}}\left( {t - \frac{x}{c}} \right)

    Bz=1.1imes10−7cos⁡πimes1011(t−xc){B_z} = 1.1 imes {10^{ - 7}}\cos \pi imes {10^{11}}\left( {t - \frac{x}{c}} \right)

    B

    Ey=11cos⁡2πimes1011(t−xc){E_y} = 11\cos 2\pi imes {10^{11}}\left( {t - \frac{x}{c}} \right)

    By=11imes10−7cos⁡2πimes1011(t−xc){B_y} = 11 imes {10^{ - 7}}\cos 2\pi imes {10^{11}}\left( {t - \frac{x}{c}} \right)

    C

    Ex=33cos⁡πimes1011(t−xc){E_x} = 33\cos \pi imes {10^{11}}\left( {t - \frac{x}{c}} \right)

    Bx=11imes10−7cos⁡πimes1011(t−xc){B_x} = 11 imes {10^{ - 7}}\cos \pi imes {10^{11}}\left( {t - \frac{x}{c}} \right)

    D

    Ey=66cos⁡2πimes1011(t−xc){E_y} = 66\cos 2\pi imes {10^{11}}\left( {t - \frac{x}{c}} \right)

    Bz=2.2imes10−7cos⁡2πimes1011(t−xc){B_z} = 2.2 imes {10^{ - 7}}\cos 2\pi imes {10^{11}}\left( {t - \frac{x}{c}} \right)

    Question Tags

    📚 Subject:Physics
    📑 Chapter:Electromagnetic Waves
    🎯Topic:Maxwell'S Equation, Displacement Current
    🎓 Ncert Level:Application
    🎯Difficulty :Medium
    ⚡ Time Required :3 mins
    🔄Ncert Concepts :Electromagnetic waves, Wave equation, Relationship between electric and magnetic fields, Wavelength, Frequency, Speed of light
    833.

    A plane electromagnetic wave travelling along the XX-direction has a wavelength of 3  mm3\;mm. The variation in the electric field occurs in the YY-direction with an amplitude 66  Vm−166\;V{m^{ - 1}}. The equations for the electric and magnetic fields as a function of x  and  tx\;and\;t are respectively

    A

    Ey=33cos⁡πimes1011(t−xc){E_y} = 33\cos \pi imes {10^{11}}\left( {t - \frac{x}{c}} \right)

    Bz=1.1imes10−7cos⁡πimes1011(t−xc){B_z} = 1.1 imes {10^{ - 7}}\cos \pi imes {10^{11}}\left( {t - \frac{x}{c}} \right)

    B

    Ey=11cos⁡2πimes1011(t−xc){E_y} = 11\cos 2\pi imes {10^{11}}\left( {t - \frac{x}{c}} \right)

    By=11imes10−7cos⁡2πimes1011(t−xc){B_y} = 11 imes {10^{ - 7}}\cos 2\pi imes {10^{11}}\left( {t - \frac{x}{c}} \right)

    C

    Ex=33cos⁡πimes1011(t−xc){E_x} = 33\cos \pi imes {10^{11}}\left( {t - \frac{x}{c}} \right)

    Bx=11imes10−7cos⁡πimes1011(t−xc){B_x} = 11 imes {10^{ - 7}}\cos \pi imes {10^{11}}\left( {t - \frac{x}{c}} \right)

    D

    Ey=66cos⁡2πimes1011(t−xc){E_y} = 66\cos 2\pi imes {10^{11}}\left( {t - \frac{x}{c}} \right)

    Bz=2.2imes10−7cos⁡2πimes1011(t−xc){B_z} = 2.2 imes {10^{ - 7}}\cos 2\pi imes {10^{11}}\left( {t - \frac{x}{c}} \right)

    Question Tags

    📚 Subject:Physics
    📑 Chapter:Electromagnetic Waves
    🎯Topic:Maxwell'S Equation, Displacement Current
    🎓 Ncert Level:Application
    🎯Difficulty :Medium
    ⚡ Time Required :3 mins
    🔄Ncert Concepts :Electromagnetic waves, wave equation, relationship between electric and magnetic field, speed of light, angular frequency
    834.

    If ε0{\varepsilon _0} and μ0{\mu _0} are respectively, the electric permittivity and the magnetic permeability of free space, ε\varepsilon and μ\mu the corresponding quantities in a medium, the refractive index of the medium is

    A

    μ εμ0 ε0\sqrt {\frac{{\mu \,\varepsilon }}{{{\mu _0}\,{\varepsilon _0}}}}

    B

    μ εμ0 ε0\frac{{\mu \,\varepsilon }}{{{\mu _0}\,{\varepsilon _0}}}

    C

    μ0 ε0μ ε\sqrt {\frac{{{\mu _0}\,{\varepsilon _0}}}{{\mu \,\varepsilon }}}

    D

    μ μ0ε ε0\sqrt {\frac{{\mu \,{\mu _0}}}{{\varepsilon \,{\varepsilon _0}}}}

    Question Tags

    📚 Subject:Physics
    📑 Chapter:Electromagnetic Waves
    🎯Topic:Maxwell'S Equation, Displacement Current
    🎓 Ncert Level:Application
    🎯Difficulty :Medium
    ⚡ Time Required :2 mins
    🔄Ncert Concepts :Refractive Index, Permittivity, Permeability, Speed of Light
    835.

    If ε0{\varepsilon _0} and μ0{\mu _0} are respectively, the electric permittivity and the magnetic permeability of free space, ε\varepsilon and μ\mu the corresponding quantities in a medium, the refractive index of the medium is

    A

    μ εμ0 ε0\sqrt {\frac{{\mu \,\varepsilon }}{{{\mu _0}\,{\varepsilon _0}}}}

    B

    μ εμ0 ε0\frac{{\mu \,\varepsilon }}{{{\mu _0}\,{\varepsilon _0}}}

    C

    μ0 ε0μ ε\sqrt {\frac{{{\mu _0}\,{\varepsilon _0}}}{{\mu \,\varepsilon }}}

    D

    μ μ0ε ε0\sqrt {\frac{{\mu \,{\mu _0}}}{{\varepsilon \,{\varepsilon _0}}}}

    Question Tags

    📚 Subject:Physics
    📑 Chapter:Electromagnetic Waves
    🎯Topic:Maxwell'S Equation, Displacement Current
    🎓 Ncert Level:Application
    🎯Difficulty :Medium
    ⚡ Time Required :2 mins
    🔄Ncert Concepts :refractive index, permittivity, permeability, speed of light
    836.

    A spectral line λ=5000A∘\lambda = 5000\mathop {\rm A}\limits^ \circ in the light coming from a distant star is observed as a λ=5200A∘\lambda = 5200\mathop {\rm A}\limits^ \circ . What will be recession velocity of the star

    A

    1.15imes107  cm/s1.15 imes {10^7}\;cm/s

    B

    1.15imes107  m/s1.15 imes {10^7}\;m/s

    C

    1.15imes107  km/s1.15 imes {10^7}\;km/s

    D

    1.15 km/s1.15\,km/s

    Question Tags

    📚 Subject:Physics
    📑 Chapter:Wave Optics
    🎯Topic:Huygen'S Principle, Doppler'S Effect
    🎓 Ncert Level:Application
    🎯Difficulty :Medium
    ⚡ Time Required :2 mins
    🔄Ncert Concepts :Doppler effect, redshift, speed of light
    837.

    A spectral line λ=5000A∘\lambda = 5000\mathop {\rm A}\limits^ \circ in the light coming from a distant star is observed as a λ=5200A∘\lambda = 5200\mathop {\rm A}\limits^ \circ . What will be recession velocity of the star

    A

    1.15imes107  cm/s1.15 imes {10^7}\;cm/s

    B

    1.15imes107  m/s1.15 imes {10^7}\;m/s

    C

    1.15imes107  km/s1.15 imes {10^7}\;km/s

    D

    1.15 km/s1.15\,km/s

    Question Tags

    📚 Subject:Physics
    📑 Chapter:Wave Optics
    🎯Topic:Huygen'S Principle, Doppler'S Effect
    🎓 Ncert Level:Application
    🎯Difficulty :Medium
    ⚡ Time Required :2 mins
    🔄Ncert Concepts :Doppler Effect, Redshift, Speed of Light
    838.

    In hydrogen spectrum the wavelength of Hα{H_\alpha } line is 656  nm656\;nm whereas in the spectrum of a distant galaxy, Hα{H_\alpha } line wavelength is 706  nm706\;nm. Estimated speed of the galaxy with respect to earth is

    A

    2imes108  m/s2 imes {10^8}\;m/s

    B

    2imes107  m/s2 imes {10^7}\;m/s

    C

    2imes106  m/s2 imes {10^6}\;m/s

    D

    2imes105  m/s2 imes {10^5}\;m/s

    Question Tags

    📚 Subject:Physics
    📑 Chapter:Wave Optics
    🎯Topic:Huygen'S Principle, Doppler'S Effect
    🎓 Ncert Level:Application
    🎯Difficulty :Medium
    ⚡ Time Required :2 mins
    🔄Ncert Concepts :Doppler effect, Electromagnetic spectrum, speed of light
    839.

    The 6563A∘6563\mathop {\rm A}\limits^ \circ line emitted by hydrogen atom in a star is found to be red shifted by 5A∘5\mathop {\rm A}\limits^ \circ . The speed with which the star is receding from the earth is

    A

    17.29imes109  m/s17.29 imes {10^9}\;m/s

    B

    4.29imes107  m/s4.29 imes {10^7}\;m/s

    C

    3.39imes105  m/s3.39 imes {10^5}\;m/s

    D

    2.29imes105 m/s2.29 imes {10^5}\,m/s

    Question Tags

    📚 Subject:Physics
    📑 Chapter:Wave Optics
    🎯Topic:Huygen'S Principle, Doppler'S Effect
    🎓 Ncert Level:Application
    🎯Difficulty :Medium
    ⚡ Time Required :2 mins
    🔄Ncert Concepts :Doppler effect, redshift, speed of light
    840.

    The 6563A∘6563\mathop {\rm A}\limits^ \circ line emitted by hydrogen atom in a star is found to be red shifted by 5A∘5\mathop {\rm A}\limits^ \circ . The speed with which the star is receding from the earth is

    A

    17.29imes109  m/s17.29 imes {10^9}\;m/s

    B

    4.29imes107  m/s4.29 imes {10^7}\;m/s

    C

    3.39imes105  m/s3.39 imes {10^5}\;m/s

    D

    2.29imes105 m/s2.29 imes {10^5}\,m/s

    Question Tags

    📚 Subject:Physics
    📑 Chapter:Wave Optics
    🎯Topic:Huygen'S Principle, Doppler'S Effect
    🎓 Ncert Level:Application
    🎯Difficulty :Medium
    ⚡ Time Required :2 mins
    🔄Ncert Concepts :Doppler Effect, Redshift, Speed of Light

    Showing 831 to 840 of 866 entries

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