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In a laser system, the energy difference between the upper (excited) energy levels E1 and the ground level E0 is (0.5 eV) at a temperature of (300 K). 1- The number of carriers at the ground level is four times the number at the upper level 2- The number of carriers in the upper level is greater than their number in the ground level 3- The number of carriers is equal 4- The number of carriers at the ground level is greater than the number of carriers at the upper level 5- The number of carriers at the upper level is four times their

In a laser system, the energy difference between the upper (excited) energy levels E1 and the ground level E0 is (0.5 eV) at a temperature of (300 K). 1- The number of carriers at the ground level is four times the number at the upper level 2- The number of carriers in the upper level is greater than their number in the ground level 3- The number of carriers is equal 4- The number of carriers at the ground level is greater than the number of carriers at the upper level 5- The number of carriers at the upper level is four times their

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In a laser system, the energy difference between the upper (excited) energy levels E1 and the ground level E0 is (0.5 eV) at a temperature of (300 K). 1- The number of carriers at the ground level is four times the number at the upper level 2- The number of carriers in the upper level is greater than their number in the ground level 3- The number of carriers is equal 4- The number of carriers at the ground level is greater than the number of carriers at the upper level 5- The number of carriers at the upper level is four times their number at the ground level
Transcribed Image Text:In a laser system, the energy difference between the upper (excited) energy levels E1 and the ground level E0 is (0.5 eV) at a temperature of (300 K). 1- The number of carriers at the ground level is four times the number at the upper level 2- The number of carriers in the upper level is greater than their number in the ground level 3- The number of carriers is equal 4- The number of carriers at the ground level is greater than the number of carriers at the upper level 5- The number of carriers at the upper level is four times their number at the ground level
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