Question

Refer to the chart and explain why a dog whistle can be heard by dogs, but not by man?

Answer 1

Hint: In the $50kHz$ range that dogs can detect, the dog whistle, which sounds quiet to humans, creates sounds. Dogs have stronger ears than humans so these high-frequency sounds can be heard and sounds from farther out can be heard.

Complete step by step answer:
In the upper range of their hearing ability, humans can hear sounds in the range of about \[20Hz\] to $23Hz$. The dogs' hearing capacity is almost twice it. In the $50kHz$ range that dogs can hear, the dog whistle, which sounds silent to humans, generates sounds. Dogs both have better hearing than humans because they can hear these high-frequency sounds, and from farther away they can hear sounds. This is because of the way they fashion their faces. Similar to how people would bring a hand up to their ear to hear more, their ears are made to cup and transfer sound inside. Dogs can also switch their ears about in various ways to hone in on sounds. These high-pitched sounds can be heard by dogs mainly because of the way they evolved. Wild dogs hunted for a living, and small mice making very high-pitched noises were their main targets. They would hear sounds that were high-pitched in order to hunt better, back before our domestic dogs evolved.

Note: Here it should be noted that dog whistle is something that has a frequency above $20kHz$ and less than $50kHz$, also the lower limit in the graph is an assumption that everyone can hear frequencies close to $0Hz$ but as we know, humans can only hear in the range of $20Hz$ to $20kHz$.