Examples of sound energy include sounds made by singing, whistling, musical instruments and horns. Sound is a vibration that causes a wave of pressure through air, water, wood and other mediums. It is heard when the wave reaches the ear and is perceived by the brain. Sound waves have characteristics including their frequency, amplitude, intensity, speed, direction and wavelength.Know More
Receipt of sound by any living creature that can hear is limited to certain frequencies. Humans can hear sounds between 20 hertz and 20,000 hertz. Low and high limits of hearing decrease as someone gets older. Species other than humans hear differently. Dogs can hear sounds higher than 20,000 hertz but cannot hear sounds below 40 hertz. Many animals use sound for navigating, communicating and perceiving danger. Species including birds, frogs and certain mammals have special organs that produce songs and other sounds. Noise refers to sound that is unwanted or is a nuisance.
Other types of energy exist in addition to sound. Radiant energy is heat and light that travels in waves in all directions. The sun and the hot coils in an electric heater are examples of radiant energy sources. Atomic energy is produced when atoms are split, such as in nuclear power plants and atomic bombs. Mechanical energy is produced by all moving objects, such as cars, bicycles and people. Chemical energy is stored in potential fuels, such as gasoline, food or combinations of chemicals. Moving electrons produce electrical energy, which occurs in batteries, motors and electrical outlets.Learn more about Optics & Waves
Examples of external stimuli include changes in temperature, sights, sounds, tastes, and smells that can affect the body and the mind. External stimuli affect one from the outside - anything that touches upon one of the five senses.Full Answer >
Binoculars are optical instruments that consist of two small side-mounted telescopes that utilize a series of lenses to provide magnification and three-dimensional viewing of distant objects. Binoculars operate by focusing light between an objective lens, an ocular lens and a prism.Full Answer >
Birds communicate by making vocal sounds, such as trills, squawks, clicks and singing. They also communicate by beating their wings and performing visual displays, including puffing their feathers and shrugging their shoulders.Full Answer >
Music is a combination of sounds with distinct pitches and a specific pattern. The pitches and unique pattern in a piece of music make a recognizable form known as a song.Full Answer >