Electromagnetic Waves
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PHXI15:WAVES

358856 A totally reflecting, small plane mirror placed horizontally faces a parallel beam of light as shown in the figure. The mass of the mirror is \(20\,g\). Assume that there is no absorption in the lens and that \({30 \%}\) of the light emitted by the source goes through the lens. The power of the source needed to support the weight of the mirror is
supporting img

1 \(80\,MW\)
2 \(100\,MW\)
3 \(130\,MW\)
4 \(150\,MW\)
PHXI15:WAVES

358857 Light with an energy flux of \(18\;W/c{m^2}\) falls on a non- reflecting suface at normal incidence. If the surface has an area of \(20\;c{m^2}\), find the average force exerted on the suface during a 30 minute time span.

1 \(1.2 \times {10^{ - 8}}\;N\)
2 \(1.2 \times {10^{ - 7}}\;N\)
3 \(1.2 \times {10^{ - 6}}\;N\)
4 \(1.2 \times {10^{ - 5}}\;N\)
PHXI15:WAVES

358858 Find the radiation pressure of solar radiation on the surface of earth. Solar constant is \(1.4\,kW{m^{ - 2}}\) (Assume complete absorption)

1 \(9.4 \times {10^{ - 6}}\;Pa\)
2 \(4.7 \times {10^{ - 6}}\;Pa\)
3 \(4.7 \times {10^{ - 5}}\;Pa.\)
4 \(2.37 \times {10^{ - 6}}\;Pa\)
PHXI15:WAVES

358859 Statement A :
Electromagnetic waves exert radiation pressure.
Statement B :
Electromagnetic waves carry energy.

1 Statement A is correct but Statement B is incorrect.
2 Statement A is incorrect but Statement B is correct.
3 Both statements are correct.
4 Both Statements are incorrect.
PHXI15:WAVES

358860 Light with an energy flux of \(20\;W/c{m^2}\) falls on a non-reflecting surface at normal incidence. If the surface has an area of \(30\;c{m^2}\), the total momentum delivered (for complete absorption) during \(30\;\min \) is

1 \(1.08 \times {10^7}\;kg - m/s\)
2 \(108 \times {10^4}\;kg - m/s\)
3 \(36 \times {10^{ - 4}}\;kg - m/s\)
4 \(36 \times {10^{ - 5}}\;kg - m/s\)
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PHXI15:WAVES

358856 A totally reflecting, small plane mirror placed horizontally faces a parallel beam of light as shown in the figure. The mass of the mirror is \(20\,g\). Assume that there is no absorption in the lens and that \({30 \%}\) of the light emitted by the source goes through the lens. The power of the source needed to support the weight of the mirror is
supporting img

1 \(80\,MW\)
2 \(100\,MW\)
3 \(130\,MW\)
4 \(150\,MW\)
PHXI15:WAVES

358857 Light with an energy flux of \(18\;W/c{m^2}\) falls on a non- reflecting suface at normal incidence. If the surface has an area of \(20\;c{m^2}\), find the average force exerted on the suface during a 30 minute time span.

1 \(1.2 \times {10^{ - 8}}\;N\)
2 \(1.2 \times {10^{ - 7}}\;N\)
3 \(1.2 \times {10^{ - 6}}\;N\)
4 \(1.2 \times {10^{ - 5}}\;N\)
PHXI15:WAVES

358858 Find the radiation pressure of solar radiation on the surface of earth. Solar constant is \(1.4\,kW{m^{ - 2}}\) (Assume complete absorption)

1 \(9.4 \times {10^{ - 6}}\;Pa\)
2 \(4.7 \times {10^{ - 6}}\;Pa\)
3 \(4.7 \times {10^{ - 5}}\;Pa.\)
4 \(2.37 \times {10^{ - 6}}\;Pa\)
PHXI15:WAVES

358859 Statement A :
Electromagnetic waves exert radiation pressure.
Statement B :
Electromagnetic waves carry energy.

1 Statement A is correct but Statement B is incorrect.
2 Statement A is incorrect but Statement B is correct.
3 Both statements are correct.
4 Both Statements are incorrect.
PHXI15:WAVES

358860 Light with an energy flux of \(20\;W/c{m^2}\) falls on a non-reflecting surface at normal incidence. If the surface has an area of \(30\;c{m^2}\), the total momentum delivered (for complete absorption) during \(30\;\min \) is

1 \(1.08 \times {10^7}\;kg - m/s\)
2 \(108 \times {10^4}\;kg - m/s\)
3 \(36 \times {10^{ - 4}}\;kg - m/s\)
4 \(36 \times {10^{ - 5}}\;kg - m/s\)
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PHXI15:WAVES

358856 A totally reflecting, small plane mirror placed horizontally faces a parallel beam of light as shown in the figure. The mass of the mirror is \(20\,g\). Assume that there is no absorption in the lens and that \({30 \%}\) of the light emitted by the source goes through the lens. The power of the source needed to support the weight of the mirror is
supporting img

1 \(80\,MW\)
2 \(100\,MW\)
3 \(130\,MW\)
4 \(150\,MW\)
PHXI15:WAVES

358857 Light with an energy flux of \(18\;W/c{m^2}\) falls on a non- reflecting suface at normal incidence. If the surface has an area of \(20\;c{m^2}\), find the average force exerted on the suface during a 30 minute time span.

1 \(1.2 \times {10^{ - 8}}\;N\)
2 \(1.2 \times {10^{ - 7}}\;N\)
3 \(1.2 \times {10^{ - 6}}\;N\)
4 \(1.2 \times {10^{ - 5}}\;N\)
PHXI15:WAVES

358858 Find the radiation pressure of solar radiation on the surface of earth. Solar constant is \(1.4\,kW{m^{ - 2}}\) (Assume complete absorption)

1 \(9.4 \times {10^{ - 6}}\;Pa\)
2 \(4.7 \times {10^{ - 6}}\;Pa\)
3 \(4.7 \times {10^{ - 5}}\;Pa.\)
4 \(2.37 \times {10^{ - 6}}\;Pa\)
PHXI15:WAVES

358859 Statement A :
Electromagnetic waves exert radiation pressure.
Statement B :
Electromagnetic waves carry energy.

1 Statement A is correct but Statement B is incorrect.
2 Statement A is incorrect but Statement B is correct.
3 Both statements are correct.
4 Both Statements are incorrect.
PHXI15:WAVES

358860 Light with an energy flux of \(20\;W/c{m^2}\) falls on a non-reflecting surface at normal incidence. If the surface has an area of \(30\;c{m^2}\), the total momentum delivered (for complete absorption) during \(30\;\min \) is

1 \(1.08 \times {10^7}\;kg - m/s\)
2 \(108 \times {10^4}\;kg - m/s\)
3 \(36 \times {10^{ - 4}}\;kg - m/s\)
4 \(36 \times {10^{ - 5}}\;kg - m/s\)
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PHXI15:WAVES

358856 A totally reflecting, small plane mirror placed horizontally faces a parallel beam of light as shown in the figure. The mass of the mirror is \(20\,g\). Assume that there is no absorption in the lens and that \({30 \%}\) of the light emitted by the source goes through the lens. The power of the source needed to support the weight of the mirror is
supporting img

1 \(80\,MW\)
2 \(100\,MW\)
3 \(130\,MW\)
4 \(150\,MW\)
PHXI15:WAVES

358857 Light with an energy flux of \(18\;W/c{m^2}\) falls on a non- reflecting suface at normal incidence. If the surface has an area of \(20\;c{m^2}\), find the average force exerted on the suface during a 30 minute time span.

1 \(1.2 \times {10^{ - 8}}\;N\)
2 \(1.2 \times {10^{ - 7}}\;N\)
3 \(1.2 \times {10^{ - 6}}\;N\)
4 \(1.2 \times {10^{ - 5}}\;N\)
PHXI15:WAVES

358858 Find the radiation pressure of solar radiation on the surface of earth. Solar constant is \(1.4\,kW{m^{ - 2}}\) (Assume complete absorption)

1 \(9.4 \times {10^{ - 6}}\;Pa\)
2 \(4.7 \times {10^{ - 6}}\;Pa\)
3 \(4.7 \times {10^{ - 5}}\;Pa.\)
4 \(2.37 \times {10^{ - 6}}\;Pa\)
PHXI15:WAVES

358859 Statement A :
Electromagnetic waves exert radiation pressure.
Statement B :
Electromagnetic waves carry energy.

1 Statement A is correct but Statement B is incorrect.
2 Statement A is incorrect but Statement B is correct.
3 Both statements are correct.
4 Both Statements are incorrect.
PHXI15:WAVES

358860 Light with an energy flux of \(20\;W/c{m^2}\) falls on a non-reflecting surface at normal incidence. If the surface has an area of \(30\;c{m^2}\), the total momentum delivered (for complete absorption) during \(30\;\min \) is

1 \(1.08 \times {10^7}\;kg - m/s\)
2 \(108 \times {10^4}\;kg - m/s\)
3 \(36 \times {10^{ - 4}}\;kg - m/s\)
4 \(36 \times {10^{ - 5}}\;kg - m/s\)
NCERT Exempler
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PHXI15:WAVES

358856 A totally reflecting, small plane mirror placed horizontally faces a parallel beam of light as shown in the figure. The mass of the mirror is \(20\,g\). Assume that there is no absorption in the lens and that \({30 \%}\) of the light emitted by the source goes through the lens. The power of the source needed to support the weight of the mirror is
supporting img

1 \(80\,MW\)
2 \(100\,MW\)
3 \(130\,MW\)
4 \(150\,MW\)
PHXI15:WAVES

358857 Light with an energy flux of \(18\;W/c{m^2}\) falls on a non- reflecting suface at normal incidence. If the surface has an area of \(20\;c{m^2}\), find the average force exerted on the suface during a 30 minute time span.

1 \(1.2 \times {10^{ - 8}}\;N\)
2 \(1.2 \times {10^{ - 7}}\;N\)
3 \(1.2 \times {10^{ - 6}}\;N\)
4 \(1.2 \times {10^{ - 5}}\;N\)
PHXI15:WAVES

358858 Find the radiation pressure of solar radiation on the surface of earth. Solar constant is \(1.4\,kW{m^{ - 2}}\) (Assume complete absorption)

1 \(9.4 \times {10^{ - 6}}\;Pa\)
2 \(4.7 \times {10^{ - 6}}\;Pa\)
3 \(4.7 \times {10^{ - 5}}\;Pa.\)
4 \(2.37 \times {10^{ - 6}}\;Pa\)
PHXI15:WAVES

358859 Statement A :
Electromagnetic waves exert radiation pressure.
Statement B :
Electromagnetic waves carry energy.

1 Statement A is correct but Statement B is incorrect.
2 Statement A is incorrect but Statement B is correct.
3 Both statements are correct.
4 Both Statements are incorrect.
PHXI15:WAVES

358860 Light with an energy flux of \(20\;W/c{m^2}\) falls on a non-reflecting surface at normal incidence. If the surface has an area of \(30\;c{m^2}\), the total momentum delivered (for complete absorption) during \(30\;\min \) is

1 \(1.08 \times {10^7}\;kg - m/s\)
2 \(108 \times {10^4}\;kg - m/s\)
3 \(36 \times {10^{ - 4}}\;kg - m/s\)
4 \(36 \times {10^{ - 5}}\;kg - m/s\)
NCERT Exempler