أكاديميا - كولنز - معاجم الجيب العلمية - الفيزياء - انكليزي - فرنسي - عربي الحرف ٥_ a

Academia - Collins - Pocket Scientific Dictionaries - Physics - English - French - Arabic - Letter 5_ A


atomic radiations
radiations fpl atomiques

Atomic radiation.

Radiation type

alpha

What it is
Nucleus of a helium atom

the shipment
2+

Mass (in atomic mass units)
4

The material needed to absorb most of the radiation
10 cm of air or a piece of paper

Deflection in a magnetic field
a little . Use the left hand rule to find direction

Ionization produced in air
About 20,000 ions/cm


Radiation type

Beta B

What it is
High speed electron

the shipment
1-

Mass (in atomic mass units)
1/1836

The material needed to absorb most of the radiation
2mm aluminum

Deflection in a magnetic field
a lot . In the opposite direction to the alpha direction

Ionization produced in air
About 200 ions/cm


Radiation type

Gamma

What it is
Electromagnetic radiation

the shipment
0

Mass (in atomic mass units)
0

The material needed to absorb most of the radiation
Several centimeters of lead

Deflection in a magnetic field
nothing

Ionization produced in air
some ions


attraction
attraction f

Attract . A type of force.


audible frequency
The frequency is audible

Audible frequency. Sound with frequencies between 25 and 25,000 Hz that the human ear can hear. The higher frequencies in this range become inaudible with age. Dogs can hear sound frequencies that are higher than the frequencies that humans hear, and they can therefore respond to specially designed whistles that emit tones that are higher in frequency than the frequency range that humans hear.