Flashcards
Atom
Flashcards do conjunto (40)
- 1Thomason proposed thatA positively charged substance filled the atom
- 2Why did Rutherford use a lead sheet with a slit?To avoid the scattering the beam of alpha rays
- 3What type of particle did Rutherford use and why?He used an alpha particle because it had high energy
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- 5Some of the alpha particles difflected when collided with thin gold foil, why?Alpha particle approach a positively charged region of the nucleus.
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- 13What does a gas-discharge tube contain?1-Low pressure gas
2- glad tube that has electrons attached to each end. (To give out high potential) - 14When does a gas glows in a glass tube ?When a large potential difference is applied across the tube.
- 15What happens when a gas is passed through a prism (emission spectra)?Different gasses glowed with unique color, it is considered the fingerprint of each element.
- 16What’s type of gasses are used in absorption spectra ?Cold gasses
- 17What is the similarity between emission and absorption spectra?Both are used to measure unknown gasses wavelength
- 18What type of spectrum is used to study stars and space ?Absorption spectra ( dark lines of Fraunhofer lines)
- 19Spectrometer is?A device used to study spectrum of material by observing the spectra that they emit or absorb.
- 20Why was hydrogen used extensively to study the atoms?Because it’s the lightest element and has the simplest spectrum.
- 21Who suggested that electrons orbit the nucleus like planets orbit the sun.Rutherford
- 22Problems with the planetary model.1- atoms are stable, so the model doesn’t agree with laws of EM.
2- predicted that the accelerating electrons would radiate energy at all wavelengths. - 23Bohr began with ?Plenary arrangements
- 24What did Bohr claimed thathe proposed that energy levels of electrons are discrete and that the electrons revolve in stable orbits around the atomic nucleus but can jump from one energy level (or orbit) to another.
- 25Quantized energy levels are called ?Energy level
- 26E photon =Ephoton= hf
- 27Delta E =E= Ef-Ei
- 28En=En= (-13.6)1/n2
- 29Rn=Rn=n2 x r1
- 30E=E=hc/λ
- 31Fe brogli wavelength law:λn= 2 πr/n
- 32What does LASER stand forLight Amplification by Stimulated Emission Radiation
- 33Characteristics of laser?1-monochromatic (وحيد اللون )
2-coherent( same f, wavelength, phase and direction )
3-produces from constructive interference (results light with high intensity) - 34Spotenous and stimulated emission:Explaintion
- 35Explain how absorption, spontaneous and stimulated emission accrues.Enter text here...
- 36Compare between laser and light in the following:Enter text here...
- 37A series that falls in E2 is ?Balmier series visible (vbgr)
- 38A series that fall down to E1 or n=1 isLyman series (ultraviolet)
- 39A series that falls down to n=3 is ?Paschen series (infrared)
- 40Lost some of the laser applications :1- lunar research
2- laser printer
3-CD or DVD
4- Laser pointer
5- automatic doors