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A gas expands from I to F in the figure. The energy added to the gas by heat is 423 J when the gas goes from I to F along the diagonal path. What is the change in internal energy of the gas?
Answer in units of J
With the help of appropriate energy level diagram, explain the working of a He-Ne laser. A He-Ne laser emits a beam of diameter 2103m and wavelength 630 nm. It is directed towards an aeroplane flying at a height of 11 km. Calculate the diameter of the light patch produced on the surface of the aeroplan
There are 400kf/min of water being handled by a pump. The lift us firm 20-m deep well and the delivery velocity ks 15m/s. Find (a) the change in potential energy, (b) kinetic energy, (c) the required power of the pumping unit; g= 9.81m/s²
What is the temperature gradient of 8.0 cal per second per cm with 210 Wk
A 40 kg slab rests on a frictionless floor. A 10 kg block rests on the top of the slab. The coefficient of static
friction is 0.6 while the coefficient of kinetic friction is 0.4. 10 kg block is acted upon by a horizontal force
F. What is the resulting acceleration of the slab if (i) F = 40 N
a ball of 0.25kg is coming with 20m/s velocity collide with bat for 1s how many newton force is apply for stop the ball
5. Obtain the value of P3 (x) using Rodrigues' formula
Pn(x) = 1/(2n)n! x dn/dxn *(x2-1)n
Question 5
5.1 The electron and hole mobilities in a Si sample are 0.135 and 0.48m2/V-s respectively. Determine the conductivities of intrinsic Si at 300 K if the intrinsic carrier concentration is 1.5x106 atom/m3. The sample is then doped with 1023 phosphorus atom/m3. Determine the equilibrium hole concentration, conductivity, and position of the Fermi level relative to the intrinsic level.
5.2 Indicate on an energy level diagram the conduction and valence bands, donor and acceptor states and the position of Fermi level for
(i) an intrinsic semiconductor.
(ii) a n-type semiconductor.
(iii) a p-type semiconductor.
A person riding a bicycle is going uphill at 8 m/s. What is the kinetic energy of the system if the total mass of the person and his bicycle is 10.0 kg?
Question 3
If the velocity of sound in a solid is of the order 103 m/s, compare the frequency of the sound wave λ = 20 Å for (a) a monoatomic system and (b) acoustic waves and optical waves in a diatomic system containing two identical atoms (M=m) per unit cell of interatomic spacing 2.2 Å.
Question 4
4.1 The conductivity of silver is 6.5 x107 per Ohm per m and number of conduction electrons per m3 is 6x1028 Find the mobility of conduction electrons and the drift velocity in an electric field of 1 V/m. Given m = 9.1 x 10-31kg and e=1.602 x 10-19C.
4.2 What is Lorentz number? The thermal and electrical conductivities of Cu at 20oC are 390 Wm-1K-1 and 5.87x107W-1m-1 respectively. Calculate Lorentz number.
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#339914 on Dec 2023