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Question 45503

posted 10 months ago

3. Consider a 1 kW AM radio transmitter at 700 kHz.
ts) Calculate the values of wavelength and energy for this photon.
ats) Calculate the number of photons emitted per second from the antenna.

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Question 45504

posted 10 months ago

4. Consider a Copper metal shaped as an elongated parallelepiped. An electric field isapplied to this sample in the +y direction and the magnetic field is applied in the +zdirection, as schematically shown in the Figure below.
(a) (2 points) Indicate the direction (choose among +x, -x, +y, -y, +z, -z) in which the moving electrons are deflected/accumulated by the magnetic field.
(b) (2 points) What is the name of the force causing this deflection?
(c) (2 points) Indicate the direction (choose among +x, -x, +y, -y, +z, -z) of the Hallfield (the electric field set up by the deflected electrons).
(d) (14 points) A Hall effect experiment is carried out at room temperature and the following results are obtained: RH = -0.55 x 10-1ºm³A's', o = 5.9 x 107 Q''m' Calculate the drift mobility and concentrations of conduction electrons in copper.

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Question 45502

posted 10 months ago

2. (20 points) The resistivity of pure gold at 0°C (273K) is measured to be 25 x 10-9 Q m.The temperature coefficient of resistance for Au is 1/233 K-'. Calculate the resistivity of gold at -40°C.

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Question 45505

posted 10 months ago

5. (20 points) When a clean surface of silver is irradiated with light of wavelength 230nm, the kinetic energy of the ejected electrons is measured to be 0.805 eV. Calculate the work function and the threshold frequency of silver.

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Question 45501

posted 10 months ago

1. The resistivity of aluminum (Al, Z=13) at 25 °C has been measured to be 2.72 x 10-8 Nm. Density is 2.70 g cm³ and atomic mass, Mat, is 27 g/mol.
Es) How many valence electrons does Al atom have?
(d) (10 points) Calculate the drift mobility and mean free time between collisions for theconduction electrons in aluminum at 25 °C.
(c) (5 points) Calculate the concentration (#/cm³ or #/m³) of conduction electrons.Provide any assumption used.
) What type of primary bonding do you expect Al to have?

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Question 42062

posted 11 months ago

4. The plates of the parallel-plate capacitor shown in the figure has an area of A and a separation of d. Assume that the electric field in the medium has only a z component. The upper plate is held at a potential of Vo-and the lower plate is grounded. The dielectric between the two plates has a permittivity of e = az", where a and n are constants.
(b) Determine the electric field intensity in the medium,
(c) Determine the potential distribution in the medium,
(d) Determine the electric flux density in the medium,
(e) Determine the charge distribution on each plate, and
(f) the capacitance of the parallel-plate capacitor.

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Question 42284

posted 11 months ago

\text { According to the equation, } V=Q /[\kappa c o A / d+\text { Csys }], V \text { versus } d \text { is: }
Exponential direct relationship.
O Exponential inverse relationship.
Linear direct relationship.
Linear inverse relationship.

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Question 42285

posted 11 months ago

Capacitor's plate diameter is measured to calculate the:
O Area of the plates.
O Distance between plates.
O Charge of the plates.
Potential difference between capacitor's plates.

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Question 42287

posted 11 months ago

The simplest form of capacitor consist of:
O Two conducting plates,
O Single conducting plate,
Single coil.
OTWO coils.

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Question 42286

posted 11 months ago

What is the relationship between the Capacitance and the Plate Area based on the Capacitance equation?
O Directly Proportional Square
O Inversely proportional
O Directly proportional
O Inversely Proportional Square

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