Answer:
The time is 
Explanation:
Given that,
Number of energy level n= 1
Energy E₁=4 eV
We need to calculate the time period
Using formula of time period


Where, E = energy

h = Planck constant
Put the value into the formula



Hence, The time is 
Answer:
Explanation:
The sun sends out solar wind constantly - charged particles that can degrade visual sensors and the skin of spacecraft, and the occasional blast of a solar flare, which can send out clouds of charged ions that can disrupt communications and electronics on board probes and satellites.
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For a pulley system is used in an auto repair shop to lift a 200 kg engine block 1.5 m out of a car, work is done during this process is mathematically given as
w=3000J
<h3>What is the work is done?</h3>
Generally, the equation for work done is mathematically given as
W=mgh
Therefore
W=200*10*1.5
w=3000J
In conclusion, work done
w=3000J
Read more about work done
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