Light having photon energy `hupsilon` is incident on a metallic plate having work function `
Channel: Doubtnut
Date: 2020-07-26

Light having photon energy `hupsilon` is incident on a metallic plate having work function `phi` to eject the electrons. The most energetic enectrons are then allowed to enter in a region of uniform magnetic field B as shown in Fig. The electrons are projected In X-Z plane making an angle `theta` with X-axis and magnetic field is `vecB=B_0hati` along X-axis maximum pitch of the helix described by an electron is found to be p. Take mass of electron as m and charge as q. Based on the above information, answer the following questions:  Q. The correct relation between p and `B_0` is