Electromagnetic Waves
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PHXI15:WAVES

358848 A laser beam can be focussed on an area equal to the square of its wavelength. A He-Ne laser radiates energy at the rate of \(1\;mW\) and its wavelength is \(600\;nm\). The intensity of focussed beam will be

1 \(2.8 \times {10^{13}}\;W/{m^2}\)
2 \(3.2 \times {10^{13}}\;W/{m^2}\)
3 \(2.7 \times {10^9}\;W/{m^2}\)
4 \(3.2 \times {10^9}\;W/{m^2}\)
PHXI15:WAVES

358849 Energy stored in electromagnetic oscillations is in the form of

1 Electrical energy
2 Magnetic energy
3 Both 1 and 2
4 Neither of the above
PHXI15:WAVES

358850 The mean intensity of radiation on the surface of the Sun is about \({10^8}\;W/{m^2}\). The rms value of the corresponding magnetic field is closest to

1 \({10^{ - 2}}\;T\)
2 \(1\;T\)
3 \({10^{ - 4}}\;T\)
4 \({10^2}\;T\)
JEE - 2019
PHXI15:WAVES

358851 Relation between energy density of electric field \(\left(U_{E}\right)\) and magnetic field \(\left(U_{B}\right)\) will be:

1 \(\mathrm{U}_{\mathrm{E}}>\mathrm{U}_{\mathrm{B}}\)
2 \(\mathrm{U}_{\mathrm{E}} < \mathrm{U}_{\mathrm{B}}\)
3 \(\mathrm{U}_{\mathrm{E}}=\mathrm{U}_{\mathrm{B}}\)
4 \(\mathrm{U}_{\mathrm{E}} \neq \mathrm{U}_{\mathrm{B}}\)
JEE - 2021
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PHXI15:WAVES

358848 A laser beam can be focussed on an area equal to the square of its wavelength. A He-Ne laser radiates energy at the rate of \(1\;mW\) and its wavelength is \(600\;nm\). The intensity of focussed beam will be

1 \(2.8 \times {10^{13}}\;W/{m^2}\)
2 \(3.2 \times {10^{13}}\;W/{m^2}\)
3 \(2.7 \times {10^9}\;W/{m^2}\)
4 \(3.2 \times {10^9}\;W/{m^2}\)
PHXI15:WAVES

358849 Energy stored in electromagnetic oscillations is in the form of

1 Electrical energy
2 Magnetic energy
3 Both 1 and 2
4 Neither of the above
PHXI15:WAVES

358850 The mean intensity of radiation on the surface of the Sun is about \({10^8}\;W/{m^2}\). The rms value of the corresponding magnetic field is closest to

1 \({10^{ - 2}}\;T\)
2 \(1\;T\)
3 \({10^{ - 4}}\;T\)
4 \({10^2}\;T\)
JEE - 2019
PHXI15:WAVES

358851 Relation between energy density of electric field \(\left(U_{E}\right)\) and magnetic field \(\left(U_{B}\right)\) will be:

1 \(\mathrm{U}_{\mathrm{E}}>\mathrm{U}_{\mathrm{B}}\)
2 \(\mathrm{U}_{\mathrm{E}} < \mathrm{U}_{\mathrm{B}}\)
3 \(\mathrm{U}_{\mathrm{E}}=\mathrm{U}_{\mathrm{B}}\)
4 \(\mathrm{U}_{\mathrm{E}} \neq \mathrm{U}_{\mathrm{B}}\)
JEE - 2021
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PHXI15:WAVES

358848 A laser beam can be focussed on an area equal to the square of its wavelength. A He-Ne laser radiates energy at the rate of \(1\;mW\) and its wavelength is \(600\;nm\). The intensity of focussed beam will be

1 \(2.8 \times {10^{13}}\;W/{m^2}\)
2 \(3.2 \times {10^{13}}\;W/{m^2}\)
3 \(2.7 \times {10^9}\;W/{m^2}\)
4 \(3.2 \times {10^9}\;W/{m^2}\)
PHXI15:WAVES

358849 Energy stored in electromagnetic oscillations is in the form of

1 Electrical energy
2 Magnetic energy
3 Both 1 and 2
4 Neither of the above
PHXI15:WAVES

358850 The mean intensity of radiation on the surface of the Sun is about \({10^8}\;W/{m^2}\). The rms value of the corresponding magnetic field is closest to

1 \({10^{ - 2}}\;T\)
2 \(1\;T\)
3 \({10^{ - 4}}\;T\)
4 \({10^2}\;T\)
JEE - 2019
PHXI15:WAVES

358851 Relation between energy density of electric field \(\left(U_{E}\right)\) and magnetic field \(\left(U_{B}\right)\) will be:

1 \(\mathrm{U}_{\mathrm{E}}>\mathrm{U}_{\mathrm{B}}\)
2 \(\mathrm{U}_{\mathrm{E}} < \mathrm{U}_{\mathrm{B}}\)
3 \(\mathrm{U}_{\mathrm{E}}=\mathrm{U}_{\mathrm{B}}\)
4 \(\mathrm{U}_{\mathrm{E}} \neq \mathrm{U}_{\mathrm{B}}\)
JEE - 2021
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PHXI15:WAVES

358848 A laser beam can be focussed on an area equal to the square of its wavelength. A He-Ne laser radiates energy at the rate of \(1\;mW\) and its wavelength is \(600\;nm\). The intensity of focussed beam will be

1 \(2.8 \times {10^{13}}\;W/{m^2}\)
2 \(3.2 \times {10^{13}}\;W/{m^2}\)
3 \(2.7 \times {10^9}\;W/{m^2}\)
4 \(3.2 \times {10^9}\;W/{m^2}\)
PHXI15:WAVES

358849 Energy stored in electromagnetic oscillations is in the form of

1 Electrical energy
2 Magnetic energy
3 Both 1 and 2
4 Neither of the above
PHXI15:WAVES

358850 The mean intensity of radiation on the surface of the Sun is about \({10^8}\;W/{m^2}\). The rms value of the corresponding magnetic field is closest to

1 \({10^{ - 2}}\;T\)
2 \(1\;T\)
3 \({10^{ - 4}}\;T\)
4 \({10^2}\;T\)
JEE - 2019
PHXI15:WAVES

358851 Relation between energy density of electric field \(\left(U_{E}\right)\) and magnetic field \(\left(U_{B}\right)\) will be:

1 \(\mathrm{U}_{\mathrm{E}}>\mathrm{U}_{\mathrm{B}}\)
2 \(\mathrm{U}_{\mathrm{E}} < \mathrm{U}_{\mathrm{B}}\)
3 \(\mathrm{U}_{\mathrm{E}}=\mathrm{U}_{\mathrm{B}}\)
4 \(\mathrm{U}_{\mathrm{E}} \neq \mathrm{U}_{\mathrm{B}}\)
JEE - 2021
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