a photon of light from which of the following electromagneti

gomd532022-10-04 11:39:541条回答

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

已提交,审核后显示!提交回复

共1条回复
wy4528 共回答了24个问题 | 采纳率91.7%
光的能量与光的频率成正比,与光的波长成反比,你只要找到谁的波长比较短谁的能量就是最大的
2肯定是错的,如果要打出电子产生电压the beam is above threshold,3 肯定是错的,当然有光子.1得看图,不过按排除法只能选A了
1年前

相关推荐

一道AP物理题How many different photon frequencies can be emitted
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
嫣然不只一笑1年前1
zhmin 共回答了15个问题 | 采纳率86.7%
选择 D.放出6种不同频率的光.
理由:
数学算法:C24,这个是组合算法啊,2在上面,4在下面.也可以用逐级连线法:即先从最上面的那个能级分别向下面的三个能级各画一条线,可画三条;再从第二条出发,分别向下面二个能级各画一条线,可画两条;再从第三能级出发,向下面一能级画一条线,可画一条.则总共可画6条.
英语翻译Raman spectroscopy is an inelastic photon scattering spe
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.
zhzhyao1年前1
小叶哥哥 共回答了21个问题 | 采纳率100%
拉曼光谱是物质的非弹性散射光谱,能够提供材料在振动和电子性质方面的独特信息.碳质材料
种类繁多,多具有和石墨片层相似的微观结构;不同碳质材料在结构或尺寸方面存在微小的差异,其振动形式和电子特性往往就在拉曼光谱中表现出不同的特征.由于拉曼散射对碳质材料结构中的偏移对称性十分敏感,同时又具备所需样品量少、对样品无损伤等优点,使得拉曼散射成为一种探测纳米碳质材料微观结构信息的理想手段.近些年来,随着碳纳米管物性研究的逐步深入,显微拉曼光谱已经发展成为研究和表征碳纳米管物理性质的重要方法之一.一方面它可以用来确定单根碳纳米管的直径大小和管束的直径分布[2–4],碳纳米管的金属性或非金属性、以及碳纳米管的取向性等;另一方面,利用拉曼光谱也可定量评估动态条件下碳纳米管所承受的应力或应变的相对大小.在外加载荷作用下,碳纳米管中C﹦C键长会发生相应变化,导致碳纳米管拉曼光谱的特征峰位发生相应的移动,碳纳米管拉曼光谱特征峰对应力或应变环境的高灵敏度使得拉曼光谱成为研究碳纳米管聚合物复合材料中碳纳米管和聚合物分子间相互作用的绝佳工具.本文在概述碳纳米管拉曼光谱的基础上,着重评述了拉曼光谱在碳纳米管聚合物复合材料研究中的最新进展.
一个13.2nm波长的光子能量The energy of a photon that has a wavelength
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.
出家伺佛1年前3
小猫吉吉 共回答了13个问题 | 采纳率92.3%
波长*频率=速度,光速为3*10^8米/秒,所以频率是2.27*10^16/秒
光子的能量=h*频率,h为普朗克常数,h = 6.63 ×10^-34 J·s
所以能量=1.5*10^-17J
一道英文的物理题When a proton captures an electron,a photon with ane
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?
simpleleaf1年前1
我穷我ww 共回答了21个问题 | 采纳率85.7%
当一个质子捕获一个电子时,会发射出一个具有13.6电子伏能量的光子,请问这个光子的频率是多少?它是否在可见光频率范围之内?之上?之下?
E=hv=hc/lambda,E=13.6eV=2.178X10-18 J,h=6.626 × 10 -34 J·s,=> v=3.288X10 15 Hz,lambda=91.2nm,which is smaller than lower limit of visible range.The frequency is above visible range
FARO Laser Scanner Photon 120 技术特征?
qingqing81771年前1
圣与贤 共回答了19个问题 | 采纳率100%
8倍更快的扫描速度
2倍更远的扫描距离
自动注册
自动颜色调整
25米距离的系统误差≤±2毫米
超大范围快速扫描
一流的视域,360º水平和320º垂直
详情请查询-----搜 维 尔 [SouVR]
搜 维 尔[SouVR]公司经营虚拟现实、增强现实、视觉仿真软件及硬件产品.去公司官方网站去了解下,会给你提供更多信息,为您提供您参考.
Show that,in the simple process of photon a bsorption by a f
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
胡伟1年前2
王爱文 共回答了21个问题 | 采纳率90.5%
你的free electron是静止的还是匀速运动的?
不过可以不管它,反正它是惯性系.我们在相对于电子静止的参考系研究.
光子初态 能量为E=hν,动量为hν/c.
电子初态 能量为E=m*c^2 动量为0.
末态 光子被吸收,电子能量为M*c^2,动量为p.
根据相对论动力学 有
M^2*c^4=p^2*c^2+m^2*c^4
作用过程的动量守恒为
p=hν/c
作用过程的能量守恒为
M*c^2=m*c^2+hν
由以上3个方程可以得
2hνmc^2=0
显然不可能.故上述过程不存在.
In the photon picture of radiation,show that if beams of rad
In the photon picture of radiation,show that if beams of radiation of two different wavelengths are to have the same intensity (or energy density) then the numbers of the photons per unit cross-sectional areas per sec in the beams are in the same ratio as the
wavelength.请详细一点证明下了,
caitou1121年前2
xljblog 共回答了19个问题 | 采纳率78.9%
Etot=nhf(f is frequecy,h is planck constant.)
f=c/λ (c is the speed of the light and λ is wavelenth)
so Etot=nhc/λ
As the question told
E1=E2
hence
n1*hc/λ1=n2*hc/λ2
as h*c is constant
cancel out we get
n1/λ1=n2/λ2
rearrange
n1/n2=λ1/λ2