Next question, question says an electron is accelerated from rest through a potential difference of V volt. If the deep ugly wavelength of electron is 1.227 into 10 to the power minus 2 nanometer all right the potential differences again deep ugly wavelength can direct formula me I use can say. So, the formula is there, lambda will be equal to 12.27 divided by under root V or you value up to angstrom. The lambda up to the average V d color. So, which implies your under root V will be equal to 12.227 1212 1 to the power minus 10 divided by lambda. Lambda up to the average V 1.227 into 10 to the power minus 2 multiplied by 10 to the power minus 9. Again, people did not pay attention to this power minus 2. If you do not pay attention to the question nanometer then their answer is ultra quality, but the question is not difficult. So, under root V will be equal to this cancel will be here 10 will be here. This is 100 which implies V is equal to 10 to the power 4 volt. Yeah, your 10 kilo volt or 10 to the power 4 volt would be the final answer.