In the photon picture of radiation,show that if beams of rad

一道AP物理题
How many different photon frequencies can be emitted if an electron is in excited state n=4 in a hydrogen atom?
A 1
B 3
C 5
D 6
E 8

a photon of light from which of the following electromagnetic radiations carries the greater amount of energy?
A.blue B.green C.orange D.red E.yellow


a light ray strikes a photovoltatic metal as shown above.which of the following statement is correct if a voltage is introduced into the metal by the light ray?
the light ray is a blue light
the beam is below threshold
the beam does not contain any photons
A.1 B.2 C.1&3 D.2&3 E.1&2&3

英语翻译
Raman spectroscopy is an inelastic photon scattering spectrum,which reflects unique information concerning the vibration and electronic properties of materials.As for various types of carbon-based materials,even though these materials possess similar graphene-sheet-like microscopic structures,any minor differences existing in the structure or in the dimension could still be identified by means of Raman spectroscopy based on the different electronic properties and phonon vibrations of the materials.Raman spectroscopy,with its high sensitivity to shift-induced symmetry,its non-destructive quality,as well as its ability to be used in microanalytical studies,has become a powerful technique to identify the microscopic structure of nanoscale carbonbased materials .Recently,accompanying the deep exploration of the various properties of carbon nanotubes (CNTs),Raman spectroscopy has been widely used to investigate the structure and physical properties of CNTs.For instance,Raman spectroscopy has been employed successfully to determine the diameter and distribution of nanotubes [2–4],their metallic or semiconducting nature ,and their orientation .Furthermore,Raman spectra can also be used to quantify the strain or stress that the nanotubes experience under external loads .Because the shifts of specific Raman bands associated with the nanotubes result from variations of the C＝C bond length,it is possible to directlyevaluate the interactions between the nanotubes and polymers using Raman spectra under dynamic conditions.Here,on the basis of an overview of Raman spectroscopic studies of CNTs,recent progress of Raman measurements in CNTbased composites are reviewed.

一个13.2nm波长的光子能量
The energy of a photon that has a wavelength of 13.2 nm is ________ J.

一道英文的物理题
When a proton captures an electron,a photon with an
energy of 13.6 eV is emitted.What is the frequency of this
photon?Does it lie in,above,or below the visible range?

Show that,in the simple process of photon a bsorption by a free electron,without anything else occuring,energy and momentum cannot be conserved simultaeously