Answer:
Number of electrons, n = 12 electron
Explanation:
Given that,
The distance between charged spheres, 
The object experiences an electrostatic force that has a magnitude of, 
The electric force between spheres is given by :
Let there are n number of electrons. Using quantization of electric charge we get :
n = 11.93 electrons
or
n = 12 electrons
Hence, 12 electrons produce the charge on one of the objects.
Im pretty sure it’s 25,100 J because i had seen the same question a few times with this answer, hope it helps!
Answer: d = 400 m
Explanation:
Distance during acceleration
d = ½at² = ½(2.0)10² = 100 m
velocity after 10 s
v = 2.0(10) = 20 m/s
distance at constant speed
d = vt = 20(10) = 200 m
As the acceleration is the same magnitude while slowing down as speeding up, It will take the same distance to complete the deceleration 100 m
Total distance is 100 + 200 + 100 = 400 m
Answer:
Looking straight downward into a rain puddle whose surface is covered with a thin film of gasoline, you notice a swirling pattern of colors caused by interference inside the gasoline film. The point directly beneath you is colored a beautiful iridescent green. You happen to remember that the index of refraction of gasoline is 1.38 and that the wavelength of green light is about 540 nm .
Explanation:
In this case we have that the refractive index of gasoline is higher than the refractive index of air and water, therefore the maxima and minima are determined by the relationship:
2
n
d = {
( m + 1 /2
) λ max
m λ min
Since we are observing a colorful pattern, it means that we are observing the interference maximums:
2
n
d = ( m + 1/
2 ) λ ⇒ d = ( m + 1/
2
) λ
/2
n
∴ ⎪ m = 0 ⇒ d
0 = ( 0 + 1/
2
) 538
n
m / 2
⋅
1.38 = 97.5
n
m
⎪ m = 1 ⇒ d
1 = ( 1 + 1/
2
) 538
n
m / 2
⋅
1.38 = 292
n
m
⎪ m = 2 ⇒ d
2 = ( 2 + 1/
2
) 538
n
m / 2
⋅
1.38 = 487n
m
In all cases the thickness of the film is less than the wavelength of the light. This makes it possible to ensure that the rays reflected on the anterior and posterior surface belong to the same wavefront and therefore guarantee coherence between them.
