Answer:
The energy in its ground state is 10 meV.
Explanation:
It is given that,
The energy of the electron in its first excited state is 40 meV.
Energy of the electron in any state is given by :

For ground state, n = 1
 .............(1)
.............(1)
For first excited state, n = 2
 .............(2)
.............(2)
Dividing equation (1) and (2), we get :


So, the energy in its ground state is 10 meV. Hence, this is the required solution.
 
        
             
        
        
        
The correct answer is C; Bicycles.
Further Explanation:
In major cities, in the United States, have implemented signal lights specifically designed for bicycle riders. The riders also have their own designated bike lanes in many large cities. Drivers in vehicles, are to give the right of way to people on bicycles.
Bicycle riders are to follow the same laws and laws specifically for the riders or they can face fines and tickets. 
Learn more about bicycle laws at brainly.com/question/8934107
#LearnwithBrainly
 
        
             
        
        
        
A).  Convection is heating the soup in the pot.
When you stick the spoon into the hot soup, 
conduction heats the spoon all the way up to the end.
b).  Water conducts heat a little bit.  
But convection is much more responsible for the 
uniform distribution of temperature in the kiddie pool.
c).  The heat from the metal bench conducts directly 
to the buttus epidermis when you sit on it.
d).  You feel the heat on your face ... but not on the back of your 
neck ... on account of radiation from the fire and the hot grill.
        
             
        
        
        
Answer:
The  expected dynamic error is  0.019
The phase shift is -23.10°C
Explanation:
The explanation is shown on the first uploaded image 
 
        
             
        
        
        
Explanation:
It is given that,
A mass oscillates up and down on a vertical spring with an amplitude of 3 cm and a period of 2 s. It is a case of simple harmonic motion. If the amplitude of a wave is T seconds, then the distance cover by that object is 4 times the amplitude.
In 2 seconds, distance covered by the mass is 12 cm.
In 1 seconds, distance covered by the mass is 6 cm
So, in 16 seconds, distance covered by the mass is 96 cm
So, the distance covered by the mass in 16 seconds is 96 cm. Hence, this is the required solution.