The Kα X-ray of molybdenum has wavelength 0.071 nm . If the energy of a molybdenum atom with a K electron knocked out is 27.5 keV , the energy of this atom when an L electron is knocked out will be ______ keV . (Round off to the nearest integer) [ h=4.14×10−15 eVs , c=3×108 ms−1 ]