What are gamma rays class 9?

Gamma rays or gamma radiation is a stream of the high-energy electromagnetic radiation given off by an atomic nucleus undergoing radioactive decay.

What are gamma rays in?

Gamma rays have the smallest wavelengths and the most energy of any wave in the electromagnetic spectrum. They are produced by the hottest and most energetic objects in the universe, such as neutron stars and pulsars, supernova explosions, and regions around black holes.

How are gamma rays are produced?

Gamma rays originate from the settling process of an excited nucleus of a radionuclide after it undergoes radioactive decay whereas X-rays are produced when electrons strike a target or when electrons rearrange within an atom.

What is gamma rays and how do we use it?

Gamma rays are ionizing electromagnetic radiation, obtained by the decay of an atomic nucleus. Gamma rays are more penetrating, in matter, and can damage living cells to a great extent. Gamma rays are used in medicine (radiotherapy), industry (sterilization and disinfection) and the nuclear industry.

How does a gamma ray telescope work?

Since gamma rays have so much energy, they pass right through the mirror of a standard optical telescope. Instead, gamma rays are detected by the optical flashes they produce when interacting with the material in a specially designed instrument such as a scintillation detector.

Why are gamma rays useful?

Gamma rays kill microbes, and are used to sterilise food so that it will keep fresh for longer. Gamma rays are also used to sterilise medical equipment.

Which of the following is a source of production for gamma rays?

Gamma rays are produced during the disintegration of radioactive atomic nuclei and the decay of certain subatomic particles. Gamma rays are also produced through the process of pair annihilation, in which an electron and its antiparticle, a positron, vanish and two photons are created.

What are gamma rays made of?

Gamma rays are high-energy electromagnetic radiation emitted in the deexcitation of the atomic nucleus. Electromagnetic radiation includes such diverse phenomena as radio, television, microwaves, infrared radation, light, ultraviolet radiation, x rays, and gamma rays.

How does a gamma ray detector work?

DETECTING GAMMA RAYS. Gamma-ray detectors typically contain densely packed crystal blocks. As gamma rays pass through, they collide with electrons in the crystal. This process is called Compton scattering, wherein a gamma ray strikes an electron and loses energy, similar to what happens when a cue ball strikes an eight ball.

What is the energy of a gamma ray photon?

Gamma-ray photons generally have energies greater than 100 keV. For comparison, ultraviolet radiation has energy that falls in the range from a few electron volts to about 100 eV and does not have enough energy to be classified as ionising radiation.

What is the difference between ultraviolet and gamma rays?

For comparison, ultraviolet radiation has energy that falls in the range from a few electron volts to about 100 eV and does not have enough energy to be classified as ionising radiation. The high energy of gamma rays enables them to pass through many kinds of materials, including human tissue.