Final answer:
Dog trainers can experience hearing loss from the damage caused by loud noises to the inner ear nerve cells, and dogs can locate their masters by the timing of sounds using their acute hearing. Ultrasound therapy and bird aural signals are examples of how sound frequency and intensity play a role in both communication and therapeutic contexts.
Step-by-step explanation:
The concept of hearing loss due to loud sounds damaging the nerve cells in the inner ear applies to humans and animals alike. When a dog whistle emits sound at a high frequency, it is typically beyond the range of human hearing but well within a dog's capacity to hear. In the scenario described, the dog is familiar with the unique sound of its master's whistle, and it has learned to associate this sound with its master's presence. This conditioning is similar to the way a dog becomes acquainted with a hiking place. When a dog hears the whistle, even if the master has moved, the dog's ability to distinguish the sound's timing and direction, with ears receiving sound at slightly different times, allows the dog to locate the master effectively.
Analogously, therapies such as ultrasound employ high-frequency sound waves for muscle treatment, highlighting the diverse applications and effects of sound. Lastly, birds use aural signals to communicate which can also be part of understanding animal hearing and communication. These examples illustrate the significance of the intensity and frequency of sound in various contexts, from an animal's ability to hear and process to the potential for sound to cause damage or be used therapeutically.