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a_sh-v [17]
3 years ago
15

Use the ideal diode equation to calculate the voltage required to produce a current density of 25 A/cm2 for a junction of cross-

sectional area 10-4 cm2, a reverse saturation current of 2x10-15 A and at 300 K
Physics
1 answer:
NemiM [27]3 years ago
3 0

Answer:

V_{D} = 2 volts

Explanation:

First we need to find the value of diode current:

Diode\ Current = I_{D} = (25\ A/cm^2)(4\ cm^2)\\I_{D} = 100\ A

Now, we use ideal diode equation:

I_{D} = I_{S}(e^{\frac{qV_{D}}{nkT}}-1)\\

where,

Is = saturation current = 2 x 10⁺¹⁵ A

q = charge on electron = 1.6 x 10⁻¹⁹ C

V_D = Diode Voltage = ?

n = ideality factor = 1 (for ideal diodes)

k = Boltzman constant = 1.38 x 10⁻²³ J/k

T = Temperature = 300 k

Therefore,

100\ A = (2\ x\ 10^{-15}\ A)(e^{[\frac{1.6\ x\ 10^{-19} C\ V_{D}}{(1)(1.38\ x\ 10^{-23})(300\ k)}]}-1)\\\\\frac{100\ A}{2\ x\ 10^{-15}\ A} = e^{[(38.64 V^{-1})(V_{D})]}-1

taking natural log on both sides:

ln(5\ x\ 10^{16}) = ln[e^{(38.6\ V^{-1}\ V_{D})} - 1]\\38.45 =  (38.6\ V^{-1})(V_{D}) - 1\\\\V_{D} = \frac{38.45}{38.6\ V^{-1}} + 1\\\\

V_{D} = 2\ volts

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a horizontal force of 2500 N is applied for a time of 30 seconds to the car mass of 1000 kg if the car is at rest and friction i
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3 years ago
At what speed, as a fraction of c, will a moving rod have a length 65% that of an identical rod at rest
dezoksy [38]

Answer:

v/c = 0.76

Explanation:

Formula for Length contraction is given by;

L = L_o(√(1 - (v²/c²))

Where;

L is the length of the object at a moving speed v

L_o is the length of the object at rest

v is the speed of the object

c is speed of light

Now, we are given; L = 65%L_o = 0.65L_o, since L_o is the length at rest.

Thus;

0.65L_o = L_o[√(1 - (v²/c²))]

Dividing both sides by L_o gives;

0.65 = √(1 - (v²/c²))

Squaring both sides, we have;

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6 0
3 years ago
A student was given a sample of crude acetanilide to recrystallize. The initial mass of the the crude acetanilide was 166 mg. Th
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Answer:

The percentage of mass recover from recrystallization = 24.69 %

Explanation:

Given that

Initial mass of crude acetanilide = 166 gm

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The mass recover from recrystallization= 166 - 125 gm

The mass recover from recrystallization= 41 gm

The percentage of mass recover from recrystallization can be find as

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The percentage of mass recover from recrystallization = 24.69 %

4 0
3 years ago
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