According to a source, fringes is the answer. These fringes are what causes dark regions in the double -slit experiment conducted that can be observed in the screen.
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<span>These are isotopes of carbon and they all contain 6 protons and 6 electrons but each contains a difference number of neutrons - 6, 7, and 8 respectively.
^ This is the answer because an isotope changes the atomic mass, NOT atomic number. That means that the neutrons are changed, not the protons. </span>
        
                    
             
        
        
        
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
 
        
             
        
        
        
Compute first for the vertical motion, the formula is:
y = gt²/2 
0.810 m = (9.81 m/s²)(t)²/2 
t = 0.4064 s 
whereas the horizontal motion is computed by: 
x = (vx)t 
4.65 m = (vx)(0.4064 s) 
4.65 m/ 0.4064s = (vx)
(vx) = 11.44 m / s
So look for the final vertical speed. 
(vy) = gt 
(vy) = (9.81 m/s²)(0.4064 s) 
(vy) = 3.99 m/s 
speed with which it hit the ground: 
v = sqrt[(vx)² + (vy)²] 
v = sqrt[(11.44 m/s)² + (3.99 m/s)²] 
v = 12.12 m / s
        
             
        
        
        
Answer:
The Resultant Induced Emf in coil is 4∈.
Explanation:
Given that,
A coil of wire containing having N turns in an External magnetic Field that is perpendicular to the plane of the coil which is steadily changing. An Emf (∈) is induced in the coil.
To find :- 
find the induced Emf if rate of change of the magnetic field and the number of turns in the coil are Doubled (but nothing else changes).
So, 
    Emf induced in the coil represented by formula 
                           ∈  =    ...................(1)
                                  ...................(1)
                                           Where:
                                                     .    { B is magnetic field }
     { B is magnetic field }
                                                                                  {A is cross-sectional area}
                                                     .   No. of turns in coil.
 No. of turns in coil.
                                                     .   Rate change of induced Emf.
 Rate change of induced Emf.
Here, 
Considering the case :-
                                      &
  &       
 
Putting these value in the equation (1) and finding the  new emf induced (∈1)
                             
                                       ∈1 =
                                       ∈1 =
                                        ∈1 =![4 [-N\times\frac{d\phi}{dt}]](https://tex.z-dn.net/?f=4%20%5B-N%5Ctimes%5Cfrac%7Bd%5Cphi%7D%7Bdt%7D%5D)
                                         ∈1 = 4∈             ...............{from Equation (1)}      
Hence, 
The Resultant Induced Emf in coil is 4∈.