Answer:
D It must be equal to 1.00
Explanation:
The refraction in the second medium must be equal to 1. The refraction index is given as the ration of the angle of incidence to the angle of refraction. This is given as a fraction. In other words:

where Θ₁ and Θ₂ are angles of incidence an refraction, and n is the refractive index.
At a critical angle, the refraction is equal to the reflection inside the medium. This results in a phenomenon called total internal reflection where light is reflected internally in the medium.
Answer:
C
Explanation:
Because that's the spin in its orbitals.
Answer : The temperature of the chloroform will be, 
Explanation :
First we have to calculate the mass of chloroform.

conversion used : 
Now we have to calculate the temperature of the chloroform.
Formula used :

where,
q = amount of heat or energy = 1.46 kJ = 1460 J (1 kJ = 1000 J)
= specific heat capacity = 
m = mass of substance = 110.958 g
= final temperature = ?
= initial temperature = 
Now put all the given values in the above formula, we get:


Now we have to convert the temperature from Kelvin to Fahrenheit.
The conversion used for the temperature from Kelvin to Fahrenheit is:

As we know that,
or, 

...........(1)
Now put the value of temperature of Kelvin in (1), we get:


Therefore, the temperature of the chloroform will be, 
Nuclear reactions Alpha reactions
Nobel gas, it is in the last row of the periodic table and therefore is a noble gas