What is the definition of one second , what is the definition of one second?

In 1967, the 13th International Conference on Weights and Measures adopted a resolution replacing the astronomical definition of seconds with the following definition: one second is the duration of 9,192,631,770 cycles of transition radiation between two hyperfine energy levels of the ground state of the cesium-133 atom.

Definition of seconds: When the cesium-133 atom is in the non-perturbated ground state, the radiation frequency δ Cs corresponding to the transition between the two ultrafine energy levels is expressed in Hz (i.e., equal to S-1), and a fixed numerical 9192631770 value is selected to define the second.

The definition of a second is that the time of your existence has been left for one second.

Although it is confirmed that the demand curve arises naturally from the theory of consumer choice, the derivation of the demand curve itself is not a theory that proposes consumer behavior. Simply determining how people react to change doesn't require a rigorous analytical framework. However, consumer choice theory is extremely useful.

As we will illustrate in the next section, we can use this theory to more deeply determine the factors that determine family behavior.

Instant Answer Draw budget constraint lines and indifference curves for Pepsi and pizza. Illustrate what happens to the budget constraint line and consumer optimum when pizza** rises. Use your graph to divide this change into income effects and substitution effects.

Four applications. Now that we've established the basic theory of consumer choice, we can now use it to illustrate four questions about how the economy works. However, since each problem involves family decision-making, we can address these issues with the consumer behavior model we just proposed.

Are all demand curves sloping to the bottom right?

In general, when an item** goes up, people buy less. Chapter 4 refers to this normal behavior as the law of demand. This pattern manifests itself in the demand curve sloping to the lower right.

However, as far as economic theory is concerned, the demand curve also sometimes slopes to the upper right. In other words, consumers sometimes defy the law of demand and buy more when one item rises. To illustrate how this can happen, look at Figure 21-12.

In this example, the consumer buys two items – meat and potatoes. Initially, the consumer budget constraint line was a straight line from A to B. The best advantage is c.

When the potato ** rises, the budget constraint line moves inward and is now a straight line from A to D. Now the best thing is e. It is important to note that the rise in potatoes has led consumers to buy more potatoes.

1. One second is equal to one-sixtieth of a minute; One minute is equal to one-sixtieth of an hour. Because 1 minute = 60 seconds, one hour = 60 minutes.

2. The second (second) is the basic unit of time in the International System of Units, and the symbol is s. It is also sometimes referred to as SEC. by an abbreviation.

The international second is equivalent to: 1 60 minutes; 1 3,600 hours; 1 86,400 days (the time unit of the International Astronomical Union); 1/31,557,600?Julian year (the time unit of the International Astronomical Union).

4. Minutes, also known as minutes, are the units of measurement of time, and the English of minutes is minute; The hour is a secondary unit of time that is coordinated with the SI base unit. With the exception of leap seconds, an hour is generally equal to 3600 seconds, or 60 minutes, or 1 24 days. In English or mathematics, it is often used to denote "h".

The pendulum length of the second pendulum was proposed by the Royal Society of London as a unit of length in 1660. On the surface of the earth, a single pendulum about a centimeter long, a swing or a half-cycle, and the time for a swing without repetition is about one second.

The first people used the earth's rotational motion to measure time, and the basic unit was the mean solar day. At the end of the 19th century, one of the 86,400 percent of a solar day was used as one second, called the universal time second.

Due to the irregular changes in the rotation of the earth and the long-term slowing down, the world time changes year by year and cannot be kept constant. Therefore, the accuracy of the reproduction second by this definition can only be 100 millionths of a second.

Definition of seconds: When expressed in Hz (i.e., equal to S-1), a fixed value 9192631770 times is selected to define seconds.

The origin of the second: Before the Han Dynasty was envied, "time" refers to the season, and "one time" is equivalent to the current season. There are four seasons in a year, so a year is also called "four hours".

After the Han Dynasty, "Shi" no longer means the season, but is used to represent the unit of calculating time. At that time, people divided the day into 12 "hours" on an average, and "one hour" was equal to the current two hours, and people used to call this "hour" "hour".

In some classical books, we often see the word "hour", and many people mistakenly think that an hour is an hour now, but this is not true. For example, the "one watch" and "second watch" of the ancient night time refer to the hour, and the first watch to the second watch, and the second watch to the third watch are all separated by two hours.

Information on the Fundamental Defense:

The second is the basic unit of angle in the International System of Units. One second is equal to 1 60 minutes. The second is a basic unit of angle (a geometric object consisting of two rays with common endpoints) that is opened, and is an extremely small unit of angle of 1 3600 degrees.

The symbol for the second corresponds to the unicode** of 2033 (sexagesmal) and is displayed as .

You're getting the concept of loop definition wrong.

First of all, the primary intrinsic ** of cesium atom is an objective length of time, even if there is no concept of "second", how long is the first intrinsic ** of cesesium atom is still a theoretically intrinsic and measurable value. This objectively existent, inherently measurable 9192631770 times is then recorded as 1 second.

Of course, the definition of seconds at the earliest, most primitive time is certainly not this. When the concept of seconds appeared, we didn't know about the atom, the nucleus, the ** of the atom and other phenomena. In the earliest days, the concept of seconds was to divide the day into 24 hours, each hour into 60 minutes, and one-60th of a minute was set as one second.

From this it follows that the concept of time must be based on the proportions of a relatively fixed phenomenon of time. So on the one hand, we say that 1 second is defined by one-sixtieth of a minute. On the other hand, it is also said that one minute is 60 seconds.

We don't think there is a cyclic definition in between, because the ancient definition is ultimately measured in terms of a definition of the day that does not depend on the definition of the second – the time it takes for the Earth to make one revolution or the time when the Sun appears twice in a row on the horizon, and so on. But when we use this to define days, hours, minutes, and seconds. We say that a day is not the time it takes for the earth to rotate once in a day, but directly to say 24 hours.

But we don't think of this as a circular definition. Because 24 hours is not the definition of 1 day. This is just a measurement that defines the hour after the 1 day.

However, the time defined in this way is highly variable, whether it is the rotation of the earth, or the time between two consecutive sunrises or two consecutive noons. This variability has little impact on our daily lives, but it has a great impact on sophisticated scientific activities. In this way, one would want to define the unit of time in terms of a more fixed and unchanging time scale.

That's why people used atomic clocks. In the same way, the definition of the atomic clock is based on a number of periodic motions of atoms, which is like the definition of a day, not on the definition of seconds, but on periodic motion. But after defining the seconds, we can of course say how many seconds this periodic motion lasts.

Just like if we define the hours based on the day, we can still say that the day is 24 hours.

At the International Conference on Weights and Measures held in 1967, one second was defined as the time required for the number of 9192631770 natural microwave oscillations of a cesium atom. So, there is no such thing as an endless loop.