Answer:
Explanation:
Given
Lowest four resonance frequencies are given with magnitude 
50,100,150 and 200 Hz
The frequency of vibrating string is given by 

where n=1,2,3 or ...n
L=Length of string
T=Tension
 Mass per unit length
Mass per unit length 
When string is clamped at mid-point
Effecting length becomes 
Thus new Frequency becomes 

i.e. New frequency is double of old
so new lowest four resonant frequencies are 100,200,300 and 400 Hz      
 
        
             
        
        
        
Answer: 
Explanation:
Given
Charge discharged 
time taken 
Current is given as rate of change of discharge i.e.

Therefore, the average current is 
 
        
             
        
        
        
Answer:
Energy is the ability for an object to do work.
Kinetic energy is energy which a body possesses while in motion.
Stored Energy = Potential Energy.
Speed is a measurement of how quickly something is able to move or operate.
 
        
             
        
        
        
The difference between the two is, well for one
Spectrum: The entire range that the "<em>waves" </em>could be such, as visible light, x-ray's and so on.
Waves: These are different because they aren't telling you or showing the entire spectrum just which they length that they are.
<em>It may confuse you but it makes sense to me (Sorry)</em>