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Results tagged with gamma-rays
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user 43351
Electromagnetic radiation with high energies and a typcial wavelength of less than 10 picometers.
1
vote
Accepted
Is there any relation between gamma rays and the size of the nucleus?
Wavelength $\lambda$ is related energy by
$$ E = \frac{hc}{\lambda}.$$
The wavelength range you quote corresponds to energies in the range $0.1 < E < 10$ MeV, which are of course typical values for …
- 137k
1
vote
Is accelerating charges only way to produce EM radiation? What about gamma from nucleus?
The emission of photons from atoms and nuclei has much in common. Whilst the classical view of the production of radiation involves the acceleration of charged particles, or more usefully, the second …
- 137k
6
votes
How can a gamma ray conserve its momentum while travelling from the center towards the sun's...
A gamma ray photon does not travel from the core of the Sun to the photosphere. The mean free path of a gamma ray photon in the core of the Sun is of order 1 mm. The energy of the photon is absorbed o …
- 137k
6
votes
Highest background gamma ray energy?
The H.E.S.S. Gamma ray observatory in the Namibian desert has sufficient collecting area that it is able to detect (via Cerenkov radiation) very rare high energy gamma rays that were simply not availa …
- 137k
1
vote
Accepted
Question about the Blandford–Znajek process
If there is a radial component along the jet axis, then as particles move away from the BH they experience a Lorentz force, $$\vec{F}=q\vec{v}\times\vec{B},$$
that is always perpendicular to the field …
- 137k
6
votes
Accepted
Why does lead have a higher attenuation coefficient for 5.0 MeV than for 10.0 MeV?
There are three main attenuation processes for high energy photons.
The photoelectric effect and Compton scattering are more important at lower energies and their cross-section decreases monotonicall …
- 137k
2
votes
Accepted
Direction of Gamma Ray Bursts
Gamma ray bursts originate from the acceleration of charged particles along the rotation axis of the dying star (at least in theory). The gamma rays themselves are beamed and intensified in the direct …
- 137k