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LASERS MCQs

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1. . The corpuscular theory of light was put forward by





2. . Neil Bohr put forward his theory in





3. . When an electron goes from higher energy level to lower energy level it





4. . Laser is a device which can produce





5. . The most widely used types of gas lasers are





6. . The meta-stable states of atoms are





7. . The excited atoms return to their ground state in





8. . An atom can exist in meta-stable state for





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