Answer:
The velocity of the star is 0.532 c. 
Explanation:
Given that,
Wavelength of observer = 525 nm
Wave length of source = 950 nm
We need to calculate the velocity 
If the direction is from observer to star.
From Doppler effect

Put the value into the formula







Negative sign shows the star is moving toward the observer.
Hence, The velocity of the star is 0.532 c. 
 
        
             
        
        
        
Answer:
Explanation:
Let the thickness of the film is t and the refractive index of the material of film is n. 
When light travels through a sheet of thickness t, the optical path traveled is nt. 
When the path of one of slit is covered by a sheet of thickness t, the optical path becomes 
x = ( n - 1) t 
As the one fringe is shift, so the optical path changed by one wavelength. 
i.e., x = λ
So, λ = ( n - 1) t 

 
        
             
        
        
        
Answer:
5694000 min
Explanation:
Let's suppose the average American watches 4 hours of TV every day. First, we will calculate how many minutes they watch per day. We will use the conversion factor 1 h = 60 min.
(4 h/day) × (60 min/1 h) = 240 min/day
They watch 240 minutes of TV per day. Now, let's calculate how many minutes they watch per year. We will use the conversion factor 1 year = 365 day.
240 min/day × (365 day/year) = 87600 min/year
They watch 87600 min/year. Finally, let's calculate how many minutes they spend watching TV in 65 years.
87600 min/year × 65 year = 5694000 min
 
        
             
        
        
        
Answer:
compressions; rarefactions
Explanation: