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Chapter 7 LASERS MCQs

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





2. . Niels Bohr put forward his theory in:





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





4. . Laser is a device which can produce:





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





6. . The metastable states of atoms are:





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





8. . An atom can exist in metastable state for:





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