Radiation

A. Pyranometer measures global solar radiation received from entire hemisphere on a horizontal surface.
B. Solarimeter can be interpreted to mean same as pyrheliometeric instrument.
C. Pyranometer produces a voltage as a function of the incident solar radiation.
D. Pyranometer uses photovoltaic detectors.
E. Pyranometre's spectral response is linear.
Choose the correct answer from the options given below:

Consider Rydberg (hydrogen-like) atoms in a highly excited state with n around 400. The wavelength of radiation coming out of these atoms for transitions to the adjacent levels in the range.