Which two possible explanation does the video give for why light changes into colored light

The tension in string will be "3.62 N".

Explanation:

The given values are:

Length of string:

l = 3 ft

or,

 = 0.9144 m

frequency,

f = 60 Hz

Weight,

= 0.096 lb

or,

= 0.0435 kgm/s²

Now,

The mass will be:

=

=

As we know,

⇒  

On substituting the values, we get

⇒    

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or,

⇒  

⇒      

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Now,

⇒  

or,

⇒  

On putting the above given values, we get

⇒      

⇒      

⇒