MCQOPTIONS
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MCQOPTIONS
| 1. |
How many photons of a radiation of wavelength \[\lambda =5\times {{10}^{-7}}m\] must fall per second on a blackened plate in order to produce a force of \[6.62\times {{10}^{-5}}\]N? |
| A. | \[3\times {{10}^{19}}\] |
| B. | \[5\times {{10}^{22}}\] |
| C. | \[2\times {{10}^{22}}\] |
| D. | \[1.67\times {{10}^{18}}\] |
| Answer» B. \[5\times {{10}^{22}}\] | |