Fill in the blanks with suitable words: 1. If H is the probability of moving atoms of a lower energy level of atomic number (A1) to an upper level of number of atoms (A2), then (HA1) represents .. 2. One of the important processes to complete the process of balancing the upper and lower transition levels is the process of . . 3. The probability of a self-emission increases with the increase of 4. When the energy difference between two atomic or molecular levels is small, the difference in the number of atoms of these two levels is .. 5. The laser is one of the light sources.. . that emits within a wide range of the visible spectrum. P1 e 11:37