To start illustrating the relevance of sound to industry at this introductory stage, finding and mentioning professions (rather than the industries themselves) may be more effective. With sound the industrial applications are clear almost immediately f.i. through professions like musician, sound technician (TV broadcast), sound mixer (concert), audiometrist (selling hearing aids), audiologist (making audiograms), acoustic engineer, speech-trainer.
For example an audiologist can be invited to visit the class during activities about sound hearing and sound protection to answer questions prepared by students.
To engage students in technological design they could design and build their own simple models of the human eardrum or vocal cords.