[单选题]
What is the shortest-wavelenen+j1xm* ;z0:ye v;q 1uxpxynow m7x.gth X-ray photon emitted in an X-ray tube i+wakav*a qq2;z to, 0)qcdlb-) f,nnsubject to 50 kV?b,)c )foli aq-,0;+ n tq*qanv 2wzakd
A. $0.025 \; nm$
B. $0.25 \; nm$
C. $2.5 \; nm$
D. none of the given answers
