An electron is trapped in a square well of unknown width, L. It starts in unknown energy level, n. When it falls to level n-1 it
emits a photon of wavelength λphoton = 2280 nm. When it falls from n-1 to n-2, it emits a photon of wavelength λphoton = 3192 nm.
1) What is the energy of the n to n-1 photon in eV?
En to n-1 =
2) What is the energy of the n-1 to n-2 photon in eV?
En-1 to n-2 =
3) What is the initial value of n?
ninitial =
4) What is the width, L, of the well in nm?
L =
5) What is the longest wavelength of light, λlongest, the well can absorb in nm?
λlongest =
1) What is the energy of the n to n-1 photon in eV?
En to n-1 =
2) What is the energy of the n-1 to n-2 photon in eV?
En-1 to n-2 =
3) What is the initial value of n?
ninitial =
4) What is the width, L, of the well in nm?
L =
5) What is the longest wavelength of light, λlongest, the well can absorb in nm?
λlongest =
1 answer:
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Answer:
8, 8 W
Explanation:
The useful power of 1 Light Emitting Diode is
Total power required is 1.6 W
Number of Light Emitting Diodes would be
The number of Light Emitting Diodes is 8.
Power would be
The power that is required to run the Light Emitting Diodes is 8 W
The velocity of the aircraft relative to the ground is 240 km/h North
Explanation:
We can solve this problem by using vector addition. In fact, the velocity of the aircraft relative to the ground is the (vector) sum between the velocity of the aircraft relative to the air and the velocity of the air relative to the ground.
Mathematically:
where
v' is the velocity of the aircraft relative to the ground
v is the velocity of the aircraft relative to the air
is the velocity of the air relative to the ground.
Taking north as positive direction, we have:
v = +320 km/h
(since the air is moving from North)
Therefore, we find
(north)
Learn more about vector addition:
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