Guru Gobind Singh Indraprastha Vishwavidyalaya 2004 B.Tech Second Semester [] , Code : ETPH – 104 Subject : Applied Physics-II - Question Paper
Wednesday, 29 May 2013 07:10Web
II Semester exam
2nd Semester [B.Tech]
Paper Code : ETPH – 104 Subject : Applied Physics-II
Time : 1:30 Hours
Maximum Marks : 30
Note : Attempt three ques. in all. ques. one is compulsory.
Q.1 Attempt any 5 parts
An electron and a proton with the identical energy E, approach a potential barrier whose height U is greater than E. Do they have the identical probability of getting through? discuss your ans with a suitable cause.
Illustruate why an electron cannot exist inside a nucleus.
obtain the probability of finding an electron in a sphere of radius r=ao, where the normalised wave function for the electron is ?1s=v(1/(?ao3) exp(-r/ao).
obtain the least energy of an electron confined in a box of every side 0.2 nm.
Why is the energy of a particle trapped in a box is quantised? provide reasons.
What were the observations of Stern and Gerlach experiment? What phenomenon was explicitly demonstrated by their findings?
A uniformly heated black body enclosure is mantained at 1000o C and radiates energy through an opening 0.3 cm wide. compute the energy in calories radiated by the body in 1 minute.
Q.2
Derive Planck`s legal regulations of radiation to discuss black body spectral line and deduce Rayleigh Jeans legal regulations from Planck's legal regulations.
The resistance of Platinum wire at ice point is 4O and at steam point is 6.5O. The resistance of the wire is obtained to be 12O when brought in contact with a hot body. compute the temperature of the body.
discuss any 2 of the following:
Thermistor as a temperature control device.
Piezoelectric method for production of ultrasonic waves.
Labelled diagram and working of Platinum resistance thermometer
Q.3
State and discuss Uncertainity Principle.
obtain the probability of transmission (tunneling effect) for a particle with energy E, through a 1-dimensional rectangular barrier of height Vo and width a (when E
Electrons with energies 2.0 eV are incident on a barrier 10.0 eV high and 0.50 nm wide. obtain their approximate transmission probabilities. How are the electrons affected if the barrier is doubled in width?
Q.4
What is Zeeman effect? provide the Quantum explaination of normal and anomalous Zeeman effect.
discuss any 2 of the following:
Russel Saunders Coupling scheme
Space Quantisation
Ultrasonography in medicine.
Mass of the electron = 9.1 x 10-31 Kg
Planck's constant = 6.63 x 10-34 J sec
Radius of nucleus = 10-14 m
Stefan's constant = 5.735 x 10-8 J m-2 sec-1 deg-4.
| Earning: Approval pending. |
