Teacher:In this task your given a passage in Catalan. you must ask a question in Catalan, that is relevant to the passage. A question that is constructed should be precise and based on factual information from the passage. A constructed question should be: (a) unambiguous (b) be directly answerable from the passage (c) have a unique answer (d) have an answer that is a continuous span of text from the passage. Try to avoid formulating questions that (a) can be answered without referring to the passage, or (b) use exactly the same words or questions given in the passage. Try to make the question fluent in the language used. You have to create exactly one question.
Teacher: Now, understand the problem? Solve this instance: Tanmateix Michelson i Morley no observaren els desplaçament de les franges d'interferència esperat. Les seves observacions indicaven que si hi havia desplaçament era menor que una vintena part,     n  /  20   {\displaystyle n/20}  , i probablement encara menor que     n  /  40   {\displaystyle n/40}  . Però com que el desplaçament     n   {\displaystyle n}   és proporcional al quadrat de la velocitat, la velocitat relativa de la Terra i l'èter és probablement menor que una sisena part de la velocitat orbital de la Terra, això és 30/6 km/s o 5 km/s; i, en seguretat, menor que una quarta part, és a dir 30/4 km/s o 7,5 km/s.[1] Per tant, molt probablement resulta que      t  ‖   =  t  ⊥     {\displaystyle t_{\|}=t_{\perp }}  .
Student:
Com era el desplaçament segons les observacions de Michelson i Morley?