Normally, we detect sound by listening with our ears. As sound is waves, there are instruments that can detect and show the waves on a screen.
The answer to that question depends heavily on who "he" was.
If you mean, "which wavelengths of light can the human eye detect," the human eye can see wavelengths from about 390 to 700 nanometers.
Electromagnetic waves or radiation. "Light," however, generally refers to that portion of the EM spectrum that our eyes can detect.
The human ear cannot detect all possible frequencies. It has evolved to detect frequencies of sounds that are the most useful to humans, and has a maximum frequency range of about 20Hz to 20kHz, which decreases as you get older, particularly at the higher end. Infrasonic describes sounds that are too low in frequency to be heard by the human ear, and ultrasonic describes sounds that are too high in frequency to be heard by the human ear. These sounds cannot be heard by the human ear because they are outside of its range of capability.
visible light spectrum
Visible light waves are the electromagnetic waves which are detected by the human eye. They make up only a small part of the electromagnetic spectrum. So, visible light is any light in which the human eye can detect.
Normally, we detect sound by listening with our ears. As sound is waves, there are instruments that can detect and show the waves on a screen.
to detect ultrasonic waves ,place a sensitive flame in its path. if it flickers it proves its existence.
It is called visible light.
IT DETECT IT BY ULTRA VIOLET RAYS.
by our sense organ which depend upon the situation and overflow the nervous system.
A radio altimeter bounces radio waves off the ground to detect elevation.
Detect sound waves.
infrared
Sonar
Telescopes can not detect any radiation for which they were not specifically built. For example, a radio telescope is specifically designed to detect radio waves. Also, telescopes can not detect radiation that is too faint for them. What is too faint depends on the capabilities of the telescope.