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InterviewSolution
| 1. |
Threshold wavelength for sodium is 5 × 10−7 m. Photoelectric emission occurs for light of : (a) any wavelength (b) wavelength above 6 × 10−7 m (c) wavelength below 5 × 10−7 m (d) all frequency below 5 × 1014 Hz |
| Answer» <p class="MsoNormal" style="text-align: justify;"><span style="font-family:Arial,Helvetica,sans-serif"><span style="color:#000000"><strong>Correct option (c) wavelength below 5 × 10<sup>−7 </sup>m</strong></span></span></p><p class="MsoNormal" style="text-align: justify;"><span style="font-family:Arial,Helvetica,sans-serif"><span style="color:#000000"><strong>Explanation:</strong></span></span></p><p style="text-align: justify;"><span style="font-family:Arial,Helvetica,sans-serif"><span style="color:#000000">For photoelectric emission, it is necessary that the wavelength of the incident light is less than threshold value. </span></span></p><p style="text-align: justify;"><span style="font-family:Arial,Helvetica,sans-serif"><span style="color:#000000">i.e., λ < λ<sub>0</sub> </span></span></p><p style="text-align: justify;"><span style="font-family:Arial,Helvetica,sans-serif"><span style="color:#000000">Hence, the photo emission occurs for light of wavelength below 5 × 10<sup>−7</sup> m.</span></span></p> | |