The net charge of an object can be found be summing the individual charges. Since charge is quantized, all net charges are just an integer multiple of the elementary charge. q =n e where q is the net charge and n is an integer. For example, sodium can be a +1 ion and chlorine can be a -1 ion. What does this mean concerning their charge and structure?

Complete the sentence with the correct word choices: When charge is transferred between objects, it’s only the electrons that move. An electron a) (can or can’t) be broken into smaller pieces, so charge always changes in b) ( multiples or fractions) of the elementary charge. This property of electrons means that charge is quantized and the charge on any object must be c) ( a ratio or an integer multiple) of the elementary charge.

Eg Q.1/ Prove that: ni = NcNy e Using Eg = Ec-Ev Solution: n.p = ni?

An electron for a hydrogen atom absorbed enough energy to move to the third energy level and immediately returned to ground state, emitting the energy it absorbed. A second hydrogen atom had its electron absorb the same amount of energy but, instead of returning directly to ground state, it moved to the second energy level and then to ground state. What can be said of the energy emitted by these two electrons that took different paths?

In the equation below, the Balmer series involves the emission lines (wavelengths) obtained when electrons go from higher energy (excited) level to 1 1 R n' 1 where, R = 1.097 x 107 m-1 %3D -- A. The ground level (n = 1) B. The first atomic level (n = 2) C. The third atomic level (n = 3) D. The fourth atomic level (n = 4) E. The fifth atomic level (n = 4) %3D %3D

A helium ion has one electron in the n=2 orbital. How much energy is necessary to liberate the final electron from this ion?   a) 13.6 eV   b) 18.1 eV   c) 27.2 eV   d) 54.4 eV   e) None of the other responses are correct.

true or false Matter is made up of atoms and therefore has positive and negative charges in it, but most matter has no net electrical charge.

Explain the process by which an energy dispersive X-ray spectrum (EDX) spectrum is generated and the origins of the La and Ka lines for Fe in the EDX shown in Figure 3 below. Why do the Fe La lines have a lower energy than the Ka lines? By considering the energy of the X-rays measured, discuss whether EDX can be used to measure whether the iron in an iron oxide is in 2+ or 3+ valence state? Which other spectroscopy technique in the transmission electron microscope (TEM) is more appropriate and why? OK 0.01 10.00 kev Figure 3: EDX spectrum of multi-element glass (NIST K309) containing 0, Al, Si, Ca, Ba and Fe.

In another universe, the electron is a spin@3/2 rather than a spin@1/2 particle, but all other physics are the same as in our universe. In this universe what are the atomic numbers of the lightest two inert gases?

If you are shining light on a Pt electrode and no electrons are emitted, what do you have to do to generate electrons? Decrease the wavelength of the light to increase the energy of the photons to emit electrons Electrons can not be emitted from Pt because like any other noble metal it does not react, even under light exposure (unlike other metals, e.g. Na, Sr or Cu) Increase the wavelength of the light to increase the energy of the photons to emit electrons Wait longer times or increase the intensity of the light source, since the energy of the absorbed light is not high enough to emit electrons from Pt surface