Answer:
\Delta E=1.22\times 10^{-22}J
Explanation:
The energy of electron in any state is given by  here h is planck's constant n is state of electron L is the infinte potential well m is the mass of electron
 here h is planck's constant n is state of electron L is the infinte potential well m is the mass of electron 
We know that 
Potential well dimension = 
Mass of electron 
So energy required to electron to jump from ground state to 3rd state 



 
        
             
        
        
        
An orange tree has seeds inside a fruit and a cypress tree has seeds inside a cone
        
                    
             
        
        
        
Answer:
A time period is denoted by 'T' . It is the time to complete one cycle of vibration. As the frequency of a wave increases, the time period of the wave decreases. The unit for time period is 'seconds
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More work is done when one man lifts the weight using a pulley. Option C is correct.
<h3>What is mechanical advantage ?</h3>
Mechanical advantage is a measure of the ratio of output force to input force in a system, it is used to obtained efficiency of  forces in levers and pulley. 
It is an effective way of amplify the force in simple machines like lever  The theoretical mechanical advantage is defined as the ratio of the force responsible for the useful work in the system  to the applied force. 
More work is done when one man lifts the weight using a pulley. With the pulley, the mechanical advantage is increasing. 
Hence, option C is correct.
To learn more about the mechanical advantage, refer to the link; 
brainly.com/question/7638820
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