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 >
Concave mirrors are used in car headlights, flashlights, telescopes, microscopes, satellite dishes and camera flashes. Dentists and ear, nose and throat doctors use concave mirrors during examinations to see a larger image of what they are examining. Concave mirrors are also used in solar-powered gadgets and visual bomb detectors.Full Answer >
Some examples of transparent objects include glass, cellophane, diamond and amber. Transparency is caused when light passes through a material without being scattered. It has application in many fields and is used both for function and aesthetical purposes.Full Answer >
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.Full Answer >