question: As the train approached the intersection and blew its horn, compressing the wavelengths of the sound, did the frequency of the horn
choices.text: increase decrease?
choices.label: A B
para: This means that as wavelengths get shorter, more waves move past a particular spot in the same amount of time.
para_anno.effect_prop: frequency of waves
para_anno.cause_dir_str: shorter
para_anno.effect_dir_str: more
para_anno.cause_dir_sign: LESS
para_anno.effect_dir_sign: MORE
para_anno.cause_prop: wavelengths
question_anno.more_effect_dir: increase
question_anno.less_effect_dir: decrease
question_anno.less_cause_prop: wavelengths
question_anno.more_effect_prop: frequency
question_anno.less_effect_prop: frequency
question_anno.less_cause_dir: frequency