12 Physics Dual Nature Of Radiation And Matter - Set No : 8 Question No :8
Question No : 8
In a
photoemissive cell with exciting wavelength  the fastest electron has speed  If the exciting wavelength is
changed to  the speed of the fastest emitted
electron will be |
| a) |  | b) |  |
| c) | Less than
| d) | Greater than |
Answer No : 8
(d)  When
wavelength is  and velocity is  then When
wavelength is  and velocity is  then Divide
equation (ii) by (i), we get   |