In physics, the cross section is a measure of the probability that a specific process will take place when some kind of radiant excitation (e.g. a particle beam, sound wave, light, or an X-ray) intersects a localized phenomenon (e.g. a particle or density fluctuation).

**Table of Contents**show

## What is cross section of a reaction?

Basically, in nuclear physics, cross sections are the probability that a certain reaction will occur between two particles for a given set of parameters. Simply, a cross section can be roughly thought of as a target, like one at a shooting range.

## What is area of cross section in physics class 11?

The area of a two-dimensional shape obtained when a three-dimensional object – such as a cube – is cut perpendicular to any given axis at a point is known as the cross sectional area in physics.

## What do you mean by the term differential cross section and total cross section?

In other words, the differential (scattering) cross-section is defined as the ratio of the intensity of radiant energy scattered in a given direction to the incident irradiance and thus has dimensions of area per unit solid angle, dΩ.

## What is cross-sectional area formula?

Cross-sectional area is determined by squaring the radius and then multiplying by 3.14. For example, if a tree is measured as 10″ DBH, the radius is 5″. Multiplying 5 by 5 equals 25, which when multiplied by 3.14 equals 78.5. Thus, the cross-sectional area of a 10″ DBH tree is 78.5.

## Why is cross-section important?

Cross sections tell physicists how likely particles are to interact in a given way. Imagine two billiard balls rolling toward one another. The likelihood of a collision depends on easy-to-grasp concepts: How big are they? How precisely are they aimed?

## How do you draw a cross section?

## What is another word for cross-sectional?

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.

## What is Q value in physics?

In nuclear physics and chemistry, the Q value for a reaction is the amount of energy absorbed or released during the nuclear reaction. The value relates to the enthalpy of a chemical reaction or the energy of radioactive decay products.

## What is a cross section in electric current?

Cross section represents a plane made by cutting across something at right angles to its length. If you cut a wire and look straight on you will see a circular plate. The area of this cross section is called its area of cross section.

## What is mean by cross section of a conductor?

A cross section is the two-dimensional area you would get by cutting through the a conductor with a plane. For eg:- a cylindrical conductor, if cut the normal way, has a circular cross section.

## What is a cross-sectional graph?

Cross sections are line graphs that show a sideways view of a landscape. They can show features such as hills and valleys, or depths, such as the depth of a river. Cross sections of hills use contour lines to determine the height of the land.

## What is a cross section view?

Britannica Dictionary definition of CROSS SECTION. 1. : a view or drawing that shows what the inside of something looks like after a cut has been made across it.

## Can a cross section be a sphere?

Spheres are perfectly round geometric objects. Spheres are NOT polyhedra. The intersection of a plane with a sphere is a circle (or a point if tangent to sphere). All cross sections of a sphere are circles.

## How do you find cross-sectional volume?

To calculate the volume of a cylinder, then, we simply multiply the area of the cross-section by the height of the cylinder: V=A⋅h. In the case of a right circular cylinder (soup can), this becomes V=πr2h.

## How do you find the cross section of A beam?

The cross-sectional area is the breadth times the depth of the structure. For example, if you have a rectangular beam spans 6m with 450mm X 600mm beam size, then the length of the beam will be 6000mm and the cross-sectional area will be 450X600 = 270000 mm2.

## What is an example of a cross section?

A cross-section is a shape that is yielded from a solid (eg. cone, cylinder, sphere) when cut by a plane. For example, a cylinder-shaped object is cut by a plane parallel to its base; then the resultant cross-section will be a circle. So, there has been an intersection of the object.

## What is a cross-section in 3d shapes?

A cross-section is a plane section that is a section of a three-dimensional object that is parallel to one of its planes of symmetry or perpendicular to one of its lines of symmetry. Describe shapes formed by cross-sections (square, rectangle, triangle, etc).

## What are contour lines?

A contour line is a line drawn on a topographic map to indicate ground elevation or depression. A contour interval is the vertical distance or difference in elevation between contour lines.

## How do I create a cross-section chart in Excel?

Create a new row in the table and in cell B4 paste the formular =(C3+B3)/2. Then copy this into all the cells in the trapeziod row. This should calculate the values for this row for you. It is possible to use Excel to draw the cross-section and calculate the area rather than drawing it by hand on graph paper.

## What is the opposite of a cross-section?

Representing a plane made by cutting across something at right angles to its length. Antonyms. lengthwise vertical inclined.

## What is the opposite of cross-sectional study?

Longitudinal studies differ from one-off, or cross-sectional, studies. The main difference is that cross-sectional studies interview a fresh sample of people each time they are carried out, whereas longitudinal studies follow the same sample of people over time.

## What is 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 formula of mass defect?

The mass defect (𝚫M) can be calculated by subtracting the original atomic mass (MA) from the sum of the mass of protons (mp= 1.00728 amu) and neutrons (mn= 1.00867 amu) present in the nucleus. Mass defect formula: 𝚫M = (Zmp + Nmn) – MA.

## What is Q-value formula?

The Q value of a nuclear reaction A + b → C + d is defined by Q = [ mA + mb – mC – md ]c 2 where the masses refer to the respective nuclei. Determine from the given data the Q-value of the following reactions and state whether the reactions are exothermic or endothermic.