| Direction: Light having photons energy \[hv\] is incident on a metallic plate having work function \[\phi \] to eject the electrons. |
The most energetic electrons are then allowed to enter in a region of uniform magnetic field B as shown in the figure.  |
| The electrons are projected in XZ-plane making an angle of\[\theta \] with X-axis and magnetic field is \[\mathbf{B}={{B}_{0}}\,i\] along X-axis. Maximum pitch of the helix described by electron is found to be p. Take mass of electron as m and charge as q. Based on above information, answer the following questions |
A)
B)
C)
D)
Correct Answer: C
Solution :
According to figure, \[{{x}_{1}}>{{x}_{2}}\] and \[{{t}_{1}}<{{t}_{2}}\] \[\therefore \] \[{{v}_{1}}=\frac{{{x}_{1}}}{{{t}_{1}}}\] and \[{{v}_{2}}=\frac{{{x}_{2}}}{{{t}_{2}}}\] thus, \[{{v}_{1}}>{{v}_{2}}\]
You need to login to perform this action.
You will be redirected in
3 sec
