The moon and Earth are examples of non-luminous objects. Non-luminous objects become visible only when they reflect light produced by a luminous object. A luminous object, such as the sun, emits its own light, because it has its own source of energy.Know More
According to Penn State University's Astrology Department, the Moon has a very dark surface that only reflects about 3 percent of the sun's light. The moon's cycle is determined by the amount of light that reflects from the moon's surface in relation to its position in orbit around Earth. When only half of its surface is lit, this is called the first or third moon quarter. As Earth and the moon orbit the sun, Earth regularly blocks the moon from the sun completely; this is called a new moon. A full moon is entirely illuminated by the sun's light.
Earthshine occurs when the Earth reflects sunlight onto the moon's surface when the moon is in its crescent phase. The crescent portion is brightly lit by reflected sunlight, while the rest of the moon dimly reflects light from the Earth. As this double-reflected light travels through space, it becomes even dimmer as some of it is absorbed into Earth’s atmosphere.Learn more about Optics & Waves
Some real-world examples of Bernoulli's principle are the upward lift exerted upon the wings of airplanes gliders and birds, the upward pressure that enables liquids to be ejected from atomizers, the path taken by a curve ball, the air and fuel mixture created inside of a vehicle carburetor and the effect of wind over a chimney on a fireplace. In each of these examples, there exists a difference in pressure that creates a force within either a liquid or gaseous fluid medium that is capable of bringing about some form of physical movement. Although the most striking example of this applied principal occurred in 1903 with the first successful airplane flight at Kitty Hawk, North Carolina, the basis of the effect was first described by Daniel Bernoulli in his book, "Hydrodynamica," published in 1738.Full Answer >
Three examples of mechanical waves are sound waves, slinky waves and water waves. Mechanical waves differ from electromagnetic waves because the energy is transferred through another medium, such as the metal in a slinky, rather than through a vacuum, such as light through outer space.Full Answer >
Music, speech and explosions are all examples of sound waves. Sound waves are mechanical vibrations in a compressible medium. The larger the amplitude of the waves, the louder the wave sounds. Because mechanical vibrations require a medium to vibrate, sound does not manifest in vacuums, such as space.Full Answer >
Examples of constructive interference include unpredictable rogue waves at sea and the behavior of sound in well-designed concert halls. In both situations, constructive interference occurs when multiple waves increase their amplitude by interfering with one another.Full Answer >