MCQOPTIONS
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MCQOPTIONS
| 1. |
What is the work function of the metal, if the light of wavelength 4000 Å generates photoelectron of velocity 6 × 105 ms-1 from it?(Mass of electron = 9 × 10-31 kg.Velocity of light = 3 × 108 ms-1Planck's constant = 6.626 × 10-34 Js.Charge of electron = 1.6 × 10-19 J eV-1) |
| A. | 4.0 eV |
| B. | 2.1 eV |
| C. | 0.9 eV |
| D. | 3.1 eV |
| Answer» C. 0.9 eV | |