Answer:
The speed of this light and wavelength in a liquid are  and 442 nm.
 and 442 nm.
Explanation:
Given that,
Wavelength = 650 nm
Index refraction = 1.47
(a). We need to calculate the speed
Using formula of speed

Where, n = refraction index
c = speed of light in vacuum
v = speed of light in medium
Put the value into the formula



(b). We need to calculate the wavelength 
Using formula of wavelength


Where,  = wavelength in vacuum
 = wavelength in vacuum
 = wavelength in medium
 = wavelength in medium
Put the value into the formula


Hence, The speed of this light and wavelength in a liquid are  and 442 nm.
 and 442 nm.
 
        
             
        
        
        
Answer:
Second Option
Explanation:
The "hard drive" or the second option is one of the main components of storing information on a computer. You already have a hard drive built into your computer, or laptop when you buy it, and you can buy additional hard drives in the form of plugins that can store even more data if your original hard drive becomes full of data.
Hope this helps.