The Doppler effect (or Doppler shift), named after the Austrian physicist Christian Doppler, who proposed it in 1842 in Prague, is the change in frequency of a wave (or other periodic event) for an observer moving relative to its source.
It is commonly heard when a vehicle sounding a siren or horn approaches, passes, and recedes from an observer. The received frequency is higher (compared to the emitted frequency) during the approach, it is identical at the instant of passing by, and it is lower during the recession.
In this paragraph, what is 'relative'?
According to this passage, the Doppler effect is the change in frequency of a wave for an observer moving relative to the source of the wave. This indicates a difference in the movement and therefore the position of the observer and source.
The Republican Party, also commonly called the GOP (for 'Grand Old Party'), is one of the two major contemporary political parties in the United States, the other being the Democratic Party. Founded by anti-slavery activists in 1854, it dominated politics nationally for most of the period from 1860 to 1932.
There have been 18 Republican presidents, the first being Abraham Lincoln, serving from 1861 to 1865, and the most recent (as of 2013) being George W. Bush, serving from 2001 to 2009.
Based on this passage, which of the following statements is not true?
The Mississippi River is key to New Orleans’ flavor and pizzazz. The seafood, the steamboat cruise, the swamp tours, and the history–it’s all there. And the jazz? There are those who would swear that the uncanny beat of the music comes from the intrepid rhythm of the Mississippi’s waters.
According to the passage, some people believe that the atmosphere and reputation of New Orleans is derived primarily from
The word “stock” simply refers to a supply. You may have a stock of T-shirts in your closet or a stock of pencils in your desk. In the financial market, stock refers to a supply of money that a company has raised. This supply comes from people who have given the company money in the hope that the company will make their money grow. A market is a public place where things are bought and sold. The term “stock market” refers to the business of buying and selling stock.
What would be the best title for this passage?
All of the laws enforced by Equal Employment Opportunity Commission, except for the Equal Pay Act, require you to file a Charge of Discrimination before you can file a job discrimination lawsuit against your employer. In addition, an individual, organization, or agency may file a charge on behalf of another person in order to protect the aggrieved person’s identity. There are time limits for filing a charge.
In this passage, which of the following words most closely means “aggrieved?”
Deadweight tonnage is a measure of how much weight a ship is carrying or can safely carry. It is the sum of the weights of cargo, fuel, fresh water, ballast water, provisions, passengers, and crew.
Which of the following does NOT go into the calculation of deadweight tonnage?
Established in 1902 in southwestern Oregon, Crater Lake National Park consists of 183,000 acres. It is home to spectacular Crater Lake, which at 1,958 feet is the deepest lake in the United States and one of the deepest in the world. The lake was created by the eruption of a volcano, Mount Mazama, more than 7,000 years ago. Surrounding glaciers filled the caldera (the volcano’s basin) with clear blue water. The lake is not all there is to see. The park boasts 680 plant species, 74 types of mammals, and 158 kinds of birds.
Based on this passage, the author would agree that…
John Fitzgerald Kennedy was born in Brookline, Massachusetts, on May 29, 1917. His father, Joseph P. Kennedy, was ambassador to Great Britain from 1937 to 1940. Kennedy graduated from Harvard University in 1940 and joined the navy the next year. He became skipper of a PT boat that was sunk in the Pacific by a Japanese destroyer. Although given up for lost, he swam to a safe island, towing an injured enlisted man.
In the passage, what does the word “ambassador” most closely mean?
The CIA is separated into four basic components: the National Clandestine Service, the Directorate, the Directorate of Science & Technology, and the Directorate of Support. They carry out “the intelligence cycle,” the process of collecting, analyzing, and disseminating intelligence information to top U.S. government officials.
Which of the following plays a major role in disseminating CIA intelligence information to top government officials?
Marvin Freeman’s groundbreaking new study of the plays of Henrik Ibsen will alter the course of Ibsen scholarship forever. Previously, scholars limited the areas of their studies to a particular phase of Ibsen’s career, since a different scholarly approach seemed to fit each of the phases. Freeman has instead taken on the entirety of Ibsen’s work. Happily, this breadth of scholarship does not diminish the depth with which Freeman explores each work. The career of Ibsen is now liberated from arbitrary divisions and stands before us as a complete picture. It will be years before we can appreciate fully the service that Freeman has rendered.
What is the main point of the paragraph?
A perennial stream or perennial river is a stream or river (channel) that has continuous flow in parts of its stream bed all year round during years of normal rainfall. "Perennial" streams are contrasted with "intermittent" streams which normally cease flowing for weeks or months each year, and with "ephemeral" channels that flow only for hours or days following rainfall.
Which of the following is the correct order of stream type from the least amount of time flowing to the most amount of time flowing over the course of a year?
The Marion County Board of Supervisors has appointed a newly established Workforce Investment Board (WIB) , which will implement the Workforce Investment Act of 1998. WIB’s mandate is to provide key policy decisions affecting the local workforce development system, and to identify and certify the areas within Marion County where WorkSource Texas Centers are located to be designated as Workforce Investment Areas.
According to this passage,
The Mayan languages form a language family spoken in Mesoamerica and northern Central America. Mayan languages are spoken by at least 6 million indigenous Maya, primarily in Guatemala, Mexico, Belize and Honduras. In 1996, Guatemala formally recognized 21 Mayan languages by name, and Mexico recognizes eight more. The Mayan language family is one of the best documented and most studied in the Americas. Modern Mayan languages descend from Proto-Mayan, a language thought to have been spoken at least 5,000 years ago.
Based on this passage, which of the following statements is true ?
Endemism is the ecological state of being unique to a defined geographic location, such as an island, nation, or other defined zone, or habitat type; organisms that are indigenous to a place are not endemic to it if they are also found elsewhere. The extreme opposite of endemism is cosmopolitan distribution.
Based on this passage, which of the following statements is false?
A utility cooperative is a type of cooperative that is tasked with the delivery of a public utility such as electricity, water or telecommunications to its members. Profits are either reinvested for infrastructure or distributed to members in the form of "patronage" or "capital credits", which are essentially dividends paid on a member's investment into the cooperative. Each customer is a member and owner of the business with an equal say as every other member of the cooperative, unlike investor-owned utilities where the amount of say is governed by the number of shares held.
A utility cooperative is most similar to which of the following types of organizations?