Learning Objectives for this Week

After going through this unit activities carefully, you should be able to

• Define sound and hearing.
• Describe relationship between the speed of sound, its frequency, and its wavelength.
• Describe the effects on the speed of sound as it travels through various media.
• Explain the effect of temperature on the speed of sound.
• Describe medical and other uses of ultrasound technology.

A sign in a train station advising travelers that the public announcement system broadcasts with a hearing induction loop, to allow travelers with a hearing aid to tune into announcements directly with their hearing aid’s receiver.

Image credit: avlxyz. (2012). https://commons.wikimedia.org/wiki/File:Hearing_induction_loop_hearing_aid.jpg