Answer:
The refractive index of glass, 
Solution:
Brewster angle is the special case of incident angle that causes the reflected and refracted rays to be perpendicular to each other or that angle of incident which causes the complete polarization of the reflected ray.
To determine the refractive index of glass:
 (1)
                 (1)
where
 = refractive index of glass
 = refractive index of glass
 = refractive index of glass
 = refractive index of glass
Now, using eqn (1)



 
        
             
        
        
        
Answer:
Work done will be 2.205 j
Explanation:
We have given that the spring is compressed b 37.5 cm 
So d = 0.375 m 
Mass of the block m = 600 gram = 0.6 kg 
Acceleration due to gravity 
Gravitational force on the block 
Now we know that work done is give by 
 
        
             
        
        
        
1,3 and 5 are the answers 
        
             
        
        
        
The sound wave would behave differently in a swimming pool than in his bedroom because sound waves travel faster in more dense mediums; such as water. The wave will travel faster in water, and slower in air.
        
             
        
        
        
Answer:
Buoyancy force and surface tension are the reactions that take places between soap and pepper experiment.
Explanation:
Surface tension:
The surface tension of a liquid is the tendency of liquid surfaces to resist an external force due to the cohesive nature of its molecules.
The pepper and soap experiment helps you to understand buoyancy force and surface tension.
Reaction between the pepper and soap is as following.
- The pepper flakes float because of buoyancy force. It makes the pepper flakes to move away to the edge of the plate.
- This happens because the liquid dish soap changes the surface tension of water. 
- And The pepper flakes are so light, it floats on the water surface due to surface tension. 
- when we add soap, it breaks the surface tension of water, but the water resists it. So they pull away from the soap along with the pepper flakes. 
- This pushes the pepper away from your soap covered finger. 
This is the reaction that take places between soap and pepper experiment.
Learn more about Pepper and soap experiment here:
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