Answer:
A. Light acts as particles, causing electrons on the surface it strikes to be destroyed.
Explanation:
- The photoelectric effect is a phenomenon that occurs when light shined onto a metal surface causes the ejection of electrons from that metal. It was observed that only certain frequencies of light are able to cause the ejection of electrons.
 
        
                    
             
        
        
        
Answer:
2.5 x 10⁷ J 
Explanation:
F = thrust of the engine = 2.3 x 10⁵ N 
d = distance traveled = 87  m 
Work done by the engine is given as 
W = F d =  (2.3 x 10⁵) (87) = 200.1 x 10⁵ J 
W' = Net work done 
W'' = work done by catapult
KE₀ = initial kinetic energy = 0 J 
KE = final kinetic energy = 4.5 x 10⁷ J 
Net work done is given as 
W' = KE - KE₀
W' = 4.5 x 10⁷ J 
We know that 
W' = W + W''
4.5 x 10⁷ = 2.001 x 10⁷ + W''
W'' = 2.5 x 10⁷ J 
 
        
             
        
        
        
Answer:
The frequency of the signal is 2 GHz
Explanation:
Given;
period of the clock signal, T = 500 ps = 500 x 10⁻¹² s
the frequency of the signal is given by;

F = 2 GHz
Therefore, the frequency of the signal is 2 x 10⁹ Hz or 2 GHz
 
        
             
        
        
        
The right answer for the question that is being asked and shown above is that: 
B.
Property Electromagnet Magnet
Permanent magnet X
Temporary magnet X X
Magnetic field created by aligning domains X
<span>Moving electric charge produces magnetic field X</span>