Question Consider a germanium crystal. Calculate the number of the quantum states per om and the energy levels per cm in the valence band (VB) and the conduction band (CB). The mass density of the germanium crystal is 5.33 g/em.
Q: There are two wires of same material and same length while the diameter of second wire is two times ...
A: D
Q: Two eesistimceb of 30 n each are seis with heat aranged Jonls perdudd for One neinete a voltge romce...
A: Formula for Heat liberated, H = I2 * R * T or H = T * V2 / R Data given : Time, T = 1 minute = 60 s...
Q: Energy stored in stretching a string per unit volume is ___________ a) 1/2×stress×strain b) stress×s...
A: A
Q: Assuming that the system is in equilibrium, find the value of m3, knowing that: r1 = 1.8 mr2 = 0.6 m...
A:
Q: (a) The acceleration of a particle moving in space is dt2 = -32k , find the particle %3D position as...
A: Part a) Given: The acceleration of a particle moving in space is d2Rdt2=-32k and the velocity of the...
Q: A simple pendulum hanging freely and at rest is vertical because in that position ___________ a) Kin...
A: D
Q: Q- 2 Two desistón be connecto d 102 to ostain to a minimum cuelnt bottey giov -10 V maximum ullent '...
A: Note: Since we only answer up to 1 question, we’ll answer the first question. Please resubmit the qu...
Q: 1. For a Solid Oxide Fuel Cell that uses hydrogen as fuel, calculate the maximum energy output possi...
A: Given: CH3OH+32O2→2H2O+CO2 ∆G=-698.2 KJ/mol
Q: If gravitational constant is decreasing with time, what will remain unchanged in case of a satellite...
A: Option c
Q: How high must the body be lifted to gain an amount of potential energy equal to the kinetic energy i...
A: B option
Q: Using superposition, find the total voltage over the 2 ohm resistor.
A: Considering the effect of voltage source alone (replacing the current source with open).The circuit ...
Q: Momentum is conserved in all collisions but not kinetic energy. a) True b) False
A: Momentum is conserved in all collisions but not kinetic energy. Kinetic energy is conserved only ine...
Q: The helicopter view in the figure shows two people pulling on a stubborn mule. The person on the rig...
A:
Q: An arrow is fired straight up from a 25.0m high tree top. a)how fast is it moving at the peak of it...
A: The arrow is fired straight up from a height of 25 mSo, initially, the arrow has a potential energy ...
Q: In a home laundry dryer, a cylindrical tub containing wet clothes is rotated steadily about a horizo...
A: This is a simple problem of circular motion The cloth will leave contact when centripetal force is ...
Q: A 1 Ω resistor and a 4 Ω resistor are connected in parallel. The combination is connected in series ...
A: Solution: Given Values, R1=1 ΩR2=4 ΩR3=5.2 ΩE=24 V
Q: A Chevrolet Corvette convertible can brake to a stop from a speed of 60.0 mi/h in a distance of 123 ...
A: Given: The initial velocity of the car is 60 mi/hr and the car stops so the final velocity of it is ...
Q: A flywheel is attached to an engine to ___________ a) Increase its speed b) Decrease its speed c) He...
A: C
Q: The water droplets in free fall are spherical due to ___________ a) Gravity b) Viscosity c) Surface ...
A: Surface tension is the tendency of liquid surfaces to shrink into the minimum surface area possible....
Q: When a cat falls from a height _____________ a) It sustains injury b) It dies c) It lands on its fee...
A: C
Q: flywheel has a mass of 25kg has a radius of 0.2m. What force should be applied tangentially to the r...
A: Option b
Q: What is the weight of the body at the centre of the earth? a) Infinity b) Same as the weight of the ...
A: C
Q: Standing is not allowed in double decker bus. a) True b) False
A: True
Q: The moment of inertia of a uniform circular disc about its diameter is 100gcm2. What is its moment o...
A: By the theorem of parallel axes, moment of inertia about a tangent parallel to the diameter, I = Id+...
Q: Deaw an electui ciait hith a statch e 2ells 3veach, 3Resistos f 102 ui Ellis", The esictance O102 cm...
A: R1, R2 and R3 are 3 resistances in series, 10 ohms eachE1 and E2 are the two cells, 3V eachS is the ...
Q: No material is perfectly elastic. a) True b) False
A: No material is perfect elastic . This is true . Every material has some properties and every mat...
Q: A 1.2 kΩ resistor carries a current of 15 mA. What is the potential difference (in V) across the res...
A: Given: R=1.2 k Ohm Current , I=15 mA Formula used: V=IR
Q: A particle of mass M is moving in a horizontal circle of radius R with uniform speed v. When it move...
A: C
Q: Assertion: On a rainy day, it is difficult to drive at high speed. Reason: The value of the coeffici...
A: Option c
Q: What is the ration of the force of attraction between two bodies kept in the air and the same distan...
A: C
Q: Comets mover around the sun in highly elliptical orbits. The gravitational force on the comet due to...
A: Option
Q: taining 6 x 10" unde isotope has an activity half-life?
A: Hey there, since you have posted multiple questions. We have answered the first one for you. Please ...
Q: Calculate the velocity of the bob of a simple pendulum at its mean position if it is able to rise to...
A: D
Q: The earth revolves around the sun with an angular velocity of 2×10-7rad/s in a circular orbit of rad...
A: Force exerted by the sun = Centripetal force F = Mrω2 F = 6×1024×1.5×1011×(2×10-7)2 = 36×1021 N
Q: 100 µc of a radioactive material injected in a patient. If its physical half life time is 30 days an...
A: Given, Initial Amount of Radioactive material,A0=100μcPhysical Half life of radioactive material =...
Q: substance breaks down by a stress of (106 N)/m2. If the density of the material of the wire is 3×(10...
A: C
Q: Suppose that the temperature at a point x, y, z in space is given by T(x,y,z)=80/1+x2+2y2+3z2, where...
A: Given- T(x,y,z)=801+x2+2y2+3z2 To find maximum rate of increase, we need to take part...
Q: A 1 Ω resistor and a 4 Ω resistor are connected in parallel. The combination is connected in series ...
A: Given: The resistors in parallel are 1 Ω and 4 Ω. The resistor in series with the parallel combinati...
Q: エ) ,3ー 62 Fud 55 とI2 エ 24V
A: Kirchhoff's current law: The total current entering a junction is equal to the total current leaving...
Q: Heat current is maximum in which of the following? a) Copper b) Steel and copper c) Copper and steel...
A: Heat current is maximum in Copper. Heat current is inversely proportional to the Thermal resistance...
Q: Why are the glasses of building milky? a) Because of unwanted deposits b) Because it becomes old c) ...
A: D option
Q: The motion of a rocket is based on the principle of conservation of ___________ a) Linear momentum b...
A: Option a
Q: An ice-making machine operates in a Carnot cycle. It takes heat from water at 0.0 oC and rejects hea...
A: as refrigerator work on carnot cycle so its efficiency would be maximum efficiency of carnot cycle ...
Q: If two objects with different masses are pushing each other, which exerts the greater force? The obj...
A: Newton's Third Law of motion states that when an object applied force on another body, there is an e...
Q: What current density would produce the vector potential, A = k s? q (where k is a constant), in cyli...
A:
Q: On the application of a constant torque, a wheel is turned from rest through 400 radians in 10s. Fin...
A: D
Q: When a body slides against a rough horizontal surface, the work done by friction is ___________ a) P...
A: Negative
Q: Moment of inertia can be regarded as the measure of the rotational inertia of the body. a) True b) F...
A: Option a
Q: Please solve it.Thanks
A: a) x, L2=x, Lx2+LY2+LZ2 =x, Lx2+x,Ly2+x,Lz2 =x, LxLx+Lxx, Lx+x, LyLy+Ly[x, Ly...
Q: A ball is thrown vertically upwards with a velocity of 20m/s. At what height, will its kinetic energ...
A: Option a
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