Correct answer is letter B. sandstone
        
             
        
        
        
Answer:
Part a)

part b)

Part c)

Part d)
here since wave is moving in negative direction so the sign of  must be positive
 must be positive
Explanation:
As we know that the speed of wave in string is given by

so we have


now we have


now we have
Part a)
 = amplitude of wave
 = amplitude of wave

part b)

here we know that


so we  have


Part c)

Part d)
here since wave is moving in negative direction so the sign of  must be positive
 must be positive
 
        
             
        
        
        
Answer:
this is a difficult question but I will try to answer it answer for this is 3220 a + b b u s y d l new
 
        
             
        
        
        
19-? Is the exact p.d across the 114-?resistor.
Current will different 
But p.d will same in parallel circuit .
        
             
        
        
        
Because it can pollute the air and cause wild life to eat stuff that has been contimanted by the air