The speed of a electron that is accelerated from rest through an electric potential difference of 120 V  is 
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How to calculate the speed of the electron?</h3>
We know, that the  energy of the system is always conserved.
Using the Law of Conservation of energy,
 U=0
 U=0
Here, K is the kinetic energy and U is the potential energy.
Now, substituting the formula of U and K, we get:
 =0------(1)
 =0------(1)
Here,
m is the mass of the electron
v is the speed of the electron
q is the charge on the electron
V is the potential difference
Let  and
 and  represent the final and initial speed.
 represent the final and initial speed.
Here,  =0
 =0
Solving for  , we get:
, we get:


=6.49 m/s
m/s
To learn more about the conservation of energy, refer to:
brainly.com/question/2137260
#SPJ4
 
        
             
        
        
        
Answer:
option D
Explanation:
given,
Intensity of sound = 20 dB
distance = 15 m
intensity of sound is increased to = 50 dB
distance between the sound level = ?
Using relation

L₁ = 20 dB        L₂ = 50 dB         r₁ = 15 m      r₂ = ?





r₂ = 0.47 m
r₂ = 47 cm
hence, the correct answer is option D
 
        
             
        
        
        
Answer:
A nuclear winter is a climatic phenomenon that would follow the detonation of several atomic bombs in the event that a nuclear war broke out. These bombs would cause firestorms that would raise smoke, dust and particles into the atmosphere that would end up in the stratosphere and eventually spread throughout the globe.
Explanation:
That idea is far fetched, because even though those same particles would absorb sunlight, it would raise the temperature in the stratosphere and cause a decrease in temperature in the Earth's layer. Unable to seep the sun's rays, many plant species would die and this would affect the entire food chain.
In addition, that temperature rise in the stratosphere would destroy part of the ozone layer, causing greater exposure to ultraviolet rays. This would end up affecting health and further damaging plant species.
 
        
             
        
        
        
The candle is giving off light
Chemical energy from the candle is converted to thermal energy