Sound waves do not travel in

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Q: 89 (UPPSC/2014)
Sound waves do not travel in—

question_subject: 

Science

question_exam: 

UPPSC

stats: 

0,65,13,4,5,4,65

keywords: 

{'sound waves': [0, 0, 2, 9], 'gases': [0, 0, 5, 12], 'solids': [0, 0, 0, 4], 'liquids': [0, 0, 0, 1], 'vacuum': [0, 1, 3, 7]}