Longitudinal studies and cross-sectional studies are two different types of research design. In a cross-sectional study you collect data from a population at a specific point in time; in a longitudinal study you repeatedly collect data from the same sample over an extended period of time.

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## What is cross section formula?

This plane is further perpendicular to the axis of its symmetry; thus, this projection is called a cross-sectional area. The cross section area formula = l x w. The volume of Cross Section. The volume of the solid is defined by the integral of the area of cross-section.

## What is the formula of area of cross section in physics?

Cross-Sectional Area of a Rectangular Solid Therefore, if a cross section is parallel to the top or bottom of the solid, the area of the cross-section is l × w. If the cutting plane is parallel to one of the two sets the sides, the cross-sectional area is instead given by l × h or w × h.

## What is the cross section area?

Cross-Sectional Area When a plane cuts a solid object, an area is projected onto the plane. That plane is then perpendicular to the axis of symmetry. Its projection is known as the cross-sectional area. Example: Find the cross-sectional area of a plane perpendicular to the base of a cube of volume equal to 27 cm3.

## What is cross section of current?

If you cut directly and squarely across the width of a wire then you will look at the end and it looks like a circle. The area of that end is the cross sectionarea, which is Pi x r^2. A larger cross section area results in lower resistance per foot when the type ofwire is the same. Suggest Corrections.

## What is a cross section in science?

In geometry and science, a cross section is the non-empty intersection of a solid body in three-dimensional space with a plane, or the analog in higher-dimensional spaces. Cutting an object into slices creates many parallel cross-sections.

## What do you mean by neutron cross section?

The neutron cross section σ can be defined as the area in cm2 for which the number of nuclei–neutron reactions taking place is equal to the product of the number of incident neutrons that would pass through the area and the number of target nuclei.

## What is a cross section in biology?

Cross-section: In anatomy, a transverse cut through a structure or tissue. The opposite is longitudinal section.

## What is another word for cross-section?

In this page you can discover 14 synonyms, antonyms, idiomatic expressions, and related words for cross-section, like: transversion, transection, cross-sectional, parallelepiped, proportion, random-sample, sample, sampling, barn, semicircle and subimages.

## How do you draw a cross-section?

## Is it cross-section or cross-section?

If you refer to a cross-section of particular things or people, you mean a group of them that you think is typical or representative of all of them. I was surprised at the cross-section of people there. A cross-section of an object is what you would see if you could cut straight through the middle of it.

## What’s a longitudinal section?

Longitudinal section: A section that is cut along the long axis of a structure. Longitudinal section is the opposite of cross-section.

## What is the difference between cross section and transverse section?

The transverse section is done in a perpendicular alignment whereas the cross section is done not in the preferred direction. The transverse section is done by slicing the object by using the imaging technique whereas cross section is done by cutting the object in slices which makes the objects in the parallel.

## Where is longitudinal section?

The longitudinal section is defined as the section along the long axis of the structure. It is also related to the other vertical sections (median, coronal and sagittal). This section is done by a plane along the vertical axis of the body. The opposite of longitudinal is a cross-section.

## What is the difference between area and cross-sectional area?

Area is somewhat that is occupied by an object when it is resting on asurface i.e area is the space which isused by the object. Whereas cross-sectional area is an area which we obtain when the same object is cut into two pieces. The area of that perticular cross section is know ascross sectional area.

## What is cross-sectional view?

: a view or drawing that shows what the inside of something looks like after a cut has been made across it. [count] a detailed cross section of the human brain.

## What is total cross section in scattering?

The total scattering cross section, σn, is defined as the total power per unit area scattered in all directions divided by the power per unit area of the incident beam.

## Why are cross-sections important?

Cross-sections are important tools that aid in the interpretation and presentation of geological data, however; they provide only a two-dimensional picture and must be interpreted accordingly. They are most effectively used in conjunction with other illustrative techniques.

## What is a cross shape called?

The shape of the cross (crux, stauros “stake, gibbet”), as represented by the letter T, came to be used as a “seal” or symbol of Early Christianity by the 2nd century.

## Is cross-section the same as diameter?

Cross section is an area. Diameter is a linear measure. That cannot be the same.

## What is a cross section of a prism?

The cross-section is the two dimensional shape repeated throughout the prism’s length. You simply work out the area of this cross-sectional shape (using your knowledge on area) and then multiply that area by the length (sometimes referred to as the depth).

## Is cross section one or two words?

In some cases it is considered acceptable to have a gap between two words, in other cases to bridge the gap with a hyphen, and in others to join the two words. ‘Cross section’ isn’t quite the same as ‘cross-section’ and would look inelegant and thus unacceptable if written as ‘crosssection’.

## What is macroscopic cross section?

The macroscopic cross-section represents the effective target area of all of the nuclei contained in the volume of the material (such as fuel pellet). The units are given in cm-1. It is the probability of neutron-nucleus interaction per centimeter of neutron travel.

## What is microscopic cross section?

The microscopic cross-section “σ” is used to characterize the probability of reaction between a neutron and an individual particle or nucleus. A neutron can have many types of interactions with a nucleus (Ragheb, 2011).

## What is area of cross section of barn?

barn, unit of area used to measure the reaction cross section (generally different from the geometric cross section) of atomic nuclei and subatomic particles in the study of their interactions with other nuclei or particles. It is equal to 10−24 square cm.