Calculate the energy of a photon of electromagnetic radiation at?

Question

0.052 nm (a wavelength contained in medical X-rays)

Answer 1

E=hv
h- is a the Planck's constant=6.626 E-34 Joules sec
v - is frequency

v= c/L
c- speed of light 2.99 E+8 m/s
L - wavelength

finally

E= hc/L
E=6.626 E-34 x 2.99 E+8 / 0.052 E-9 =3.80E-15 Joules