The U.S. Environmental Protection Agency (EPA) defines point source pollution as “any single identifiable source of pollution from which pollutants are discharged, such as a pipe, ditch, ship or factory smokestack.” Factories and sewage treatment plants are two common types of point sources.
What is an example of point source?
The United States Environmental Protection Agency (EPA) defines point source pollution as any contaminant that enters the environment from an easily identified and confined place. Examples include smokestacks, discharge pipes, and drainage ditches.
What is a point source in waves?
When the source of the wavefront can be localized to a single point, the source is said to be a point source. The figure shows a periodic surface wave spreading out from a point source. The curves (or surfaces) in the medium on which all points have the same phase is called a wavefront.
What is point source and line source?
A line source, as opposed to a point source, area source, or volume source, is a source of air, noise, water contamination or electromagnetic radiation that emanates from a linear (one-dimensional) geometry.
Is laser a point source?
LASER. LASER or light amplification by spontaneous emission of radiations is a device that consists of a highly concentrated beam of light. This means that LASER light typically falls under the category of point sources of light.
What is the difference between point and nonpoint sources?
Point and Nonpoint Pollution Sources Pollution originating from a single, identifiable source, such as a discharge pipe from a factory or sewage plant, is called point-source pollution. Pollution that does not originate from a single source, or point, is called nonpoint-source pollution.
Is Sun a point source of light?
Light bulbs, and the Sun, are often treated as point sources.
Is noise pollution a point source?
A point source of pollution is a single identifiable source of air, water, thermal, noise or light pollution.
Which of the following is not a point source?
(d) Oil wells. Explanation: The non-point sources of water pollution do not have a specific location for the discharge of water pollutants into the water bodies, e.g. run-off from crop fields, logging areas, oil spills through cargo ships, etc.
What is a point source of sound in physics?
If the source of sound is much smaller than the wavelength of sound it emits, it can be represented by a ‘point source’ or ‘monopole’. It will tend to radiate sound equally in all directions, that is to say, with ‘spherical symmetry’.
Why are stars point sources?
Since stars are so distant, they subtend a minute angle of the total visual field despite their enormous diameter. In other words, they approximate point sources of light.
What is point source of noise?
If a sound source produces spherical spreading of sound in all directions, it is a point source. Please click on the demo button to see the details. For a point source, the noise level decreases by 6 dB per doubling of distance from it.
Are car emissions point source?
Point sources include things like factories and electric power plants. Mobile sources include cars and trucks, of course, but also lawn mowers, airplanes and anything else that moves and puts pollution into the air.
What are the point source and diffuse sources of pollution?
Unlike point source pollution, which enters a river course at a specific site such as a pipe discharge, diffuse pollution occurs when potentially-polluting substances leach into surface waters and groundwater as a result of rainfall, soil infiltration and surface runoff.
What is point source water?
A point source is a single, identifiable source of pollution, such as a pipe or a drain. Industrial wastes are commonly discharged to rivers and the sea in this way.
Is laser a coherent source?
Coherent. The light from a laser is said to be coherent, which means the wavelengths of the laser light are in phase in space and time. These three properties of laser light are what make it more of a hazard than ordinary light.
What is laser source?
A homodyne laser source is typically a HeNe-laser with a single frequency beam as the output consisting of either a linear polarization under 45° or a circularly polarized beam.
What is an example of non point source pollution?
Nonpoint source pollution comes from oil, pet waste, pesticide, herbicide, fertilizer, road salt, bacteria, sediment, and any other contaminant that ends up on the ground naturally or from human activity.
What is the difference between point source and nonpoint source pollution quizlet?
Point source pollution has a known and specific location. Nonpoint source pollution does not have a specific point of origin.
What is the difference between a point source and a non point source provide a few examples of each which is easier to control?
Explanation: Point sources are for example, water discharging from an industrial plant of some kind or a waste water treatment plant. Non-point sources include run-off from agricultural lands that may wash fertilizer or other chemicals into lakes or rivers – this may occur over thousands of square kilometres.
What is the main source of light?
The main source of light is the Sun. It is the main source of light and the biggest source of energy for all living things on Earth. At its core, continuous nuclear fusion reactions occur whenever hydrogen is converted to helium.
What are the two light sources?
There are two basic types of light sources: Incandescence and Luminescence.
How do you make a point source of light?
A point source of light is obtained either by placing a screen having a fine hole, in front of die luminous body or by placing the luminous body inside a box having a fine hole on one of its side. Was this answer helpful?
What are 4 possible sources of point source pollution?
Types of point sources Examples of point sources include sewage treatment plants; oil refineries; paper and pulp mills; chemical, automobile, and electronics manufacturers; and factories.
Is an oil spill a point source pollution?
Oil Spills and Grease: Oil spills and dumping also play a major role in point source pollution. Spilled grease, oil, and other hazardous substances from overturned trucks and leaking cars have a major impact by eventually running into rivers and sewers.