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| Q. |
2 PLANCK'S THEORY (DERIVATION) |
| A. | a sin α |
| B. | a cos α |
| C. | 2a cos α |
| D. | 2a cos α |
| Answer» B. a cos α | |
| Explanation: the solid angle is defined by a region by the rays of a sphere, and is measured as a n/r2. | |
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