Possible Clues:

• Aural 'shift' named for physicist Christian
• -- effect, apparent change in the frequency of a wave
• Scientist's very quiet investment in state benefit initially rewarded
• --- shift, frequency change with speed
• Physicist who undoubtedly had an effect
• Red, blue shifts are examples of this effect
• Physicist after whom perceived shift in frequency with motion is named
• Light, sound frequency shift physicist
• Type of radar
• Austrian physicist