Hydrocarbons are compounds of hydrogen and carbon.
Photosynthesis is a process of nutrition in plants.
Thunder is a sound.
Lightning and electric eels are electrical phenomena in nature. 
        
                    
             
        
        
        
Answer:
a) 35.44 mm
b) 17.67 mm
Explanation:
u = Object distance =  3.6 m
v = Image distance
f = Focal length = 35 mm
 = Object height = 1.8 m
= Object height = 1.8 m
a) Lens Equation

The CCD sensor is 35.34 mm from the lens
b) Magnification


The person appears 17.67 mm tall on the sensor
 
        
             
        
        
        
Moving a spring back and forth creates a longitudinal wave
        
             
        
        
        
Answer:
True
Explanation:
Whenever electrons are transferred between objects, neutral matter becomes charged. For example, when atoms lose or gain electrons they become charged particles called ions. Three ways electrons can be transferred are conduction, friction, and polarization. In each case, the total charge remains the same.
I tried, hope this helps :)
* I might be wrong though
 
        
             
        
        
        
The answer to your question is (Wave W is being diffracted, Wave X is being reflected, and waves Y and Z are being refracted.)
HOPE THIS HELPS YOU CAUSE IM DOING TEST AND I HOPE IM RIGHT AS WELL
PLZ GIVE ME THE BRAINLIEST ANSWER HAVE A GOOD DAY