Does the sentence "Brandenburg adopted the song for testing purposes, listening to it again and again each time refining the scheme, making sure it did not adversely affect the subtlety of Vega's voice." provide a valid answer to the question "The song was listened to multiple times to try and refine what?"

A: yes

Does the sentence "Although inefficient, incandescent light bulbs have an advantage in applications where accurate color reproduction is important, since the continuous blackbody spectrum emitted from an incandescent light-bulb filament yields near-perfect color rendition, with a color rendering index of 100 (the best possible)." provide a valid answer to the question "What is the color rendering index of an incandescent light?"

A: yes

Does the sentence "Just two weeks prior to the election, Eisenhower vowed to go to Korea and end the war there." provide a valid answer to the question "Where did Eisenhower claim he would end the war?"

A: yes

Does the sentence "Eventually, when it was more common for electric recordings to be played back electrically in the 1930s and 1940s, the overall tone was much like listening to a radio of the era." provide a valid answer to the question "When would you have first found the moving coil microphone?"

A:
no