Calculate the strength of the transverse magnetic field required to bend all photoelectorns within a circle of radius 50 cm, when light of wavelength 4000Å is incident on a barium emitter. Work function of barium is 2.5eV. Given, `m_e=9.1xx10^(-31)kg, e=1.6xx10^(-19)C, h=6.6xx10^(-34)Js.`

Explanation

To solve the problem of calculating the strength of the transverse magnetic field required to bend all photoelectrons within a circle of radius 50 cm when light of wavelength 4000 Å is incident on a barium emitter, we can follow these steps:

### Step 1: Convert Given Values
- Convert the wavelength from angstroms to meters:
\[ \lambda = 4000 \, \text{Å} = 4000 \times 10^{-10} \, \text{m} = 4 \times 10^{-7} \, \text{m} \]
- Convert the radius from centimeters to meters:
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