Problem: A low-pressure mercury-vapor lamp has a characteristic emission line at 253 nm. Knowing that this lamp is putting out 11.8 watts of light energy, how many mercury atoms are emitted per second during operation? 1. 5.25 x 1020 atoms 2. 7.11 x 1024 atoms 3. 1.50 x 1019 atoms  4. 1.08 x 1017 atoms 5. 7.86 x 10−19 atoms 6. 4.73 x 105 atoms

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A low-pressure mercury-vapor lamp has a characteristic emission line at 253 nm. Knowing that this lamp is putting out 11.8 watts of light energy, how many mercury atoms are emitted per second during operation?

1. 5.25 x 1020 atoms

2. 7.11 x 1024 atoms

3. 1.50 x 1019 atoms 

4. 1.08 x 1017 atoms

5. 7.86 x 10−19 atoms

6. 4.73 x 105 atoms

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