Answer:
the charge carriers have an energy 2.8 10⁻¹⁹ J
Explanation:
The energy in a diode is conserved so the energy supplied must be equal to the energy emitted in the form of photons.
The energy of a photon is given by the Planck expression
E = h f
the speed of light, wavelength and frequency are related
c = λ f
we substitute
E = 
a red photon has a wavelength of lam = 700 nm = 700 10⁻⁹ m
we calculate the energy
E = 6.626 10⁻³⁴ 3 10⁸/700 10⁻⁹
E = 2.8397 10⁻¹⁹J
therefore the charge carriers have an energy 2.8 10⁻¹⁹ J,
Answer:
D. Thomson
Explanation:
The first model of the atom was proposed by J. J. Thomson.
Answer:
Habitat manipulation
Explanation:
Habitat manipulation, otherwise known as ecological engineering, is a technique of promoting natural enemies within an ecosystem by making thriving conditions more suitable for them.
<em>In this case, thriving conditions for the species (which happens to be predators and hence, natural enemies) were promoted via artificial introduction of food. </em>
Answer:
10 m/s²
Explanation:
Acceleration: This the rate of change of velocity. The unit of acceleration is m/s²
From the question,
a = (v-u)/t.................... Equation 1
Where a = acceleration of the cheetah, v = final velocity of the cheetah, u = initial velocity of the cheetah, t = time.
Given: u = 0 m/s, v = 25 m/s, t = 2.5 s.
Substitute these values into equation 1
a = (25-0)/2.5
a = 25/2.5
a = 10 m/s²
Hence the acceleration of the cheetah = 10 m/s²
The two forces acting on your body are the weight and the normal force
Explanation:
As you sit on your chair in front of the computer, there are 2 forces acting on you:
- The force of gravity, of magnitude
(where m is your mass and 
is the acceleration of gravity), acting downward - The normal reaction exerted by the chair on your body, N, acting upward, and balancing your weight
We can apply Newton's second law to this situation; the law states that the net force acting on an object is equal to the product between the mass of the object and its acceleration:
where
is the net force
m is the mass
a is the acceleration
For your body sitting on the chair,
we also know that your body is at rest, so the acceleration is zero:
This means that the net force is zero, and therefore:
Learn more about Newton's second law of motion:
brainly.com/question/3820012
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