Answer:
35°
Explanation:
By laws of reflection,
Angle of incidence = Angle of reflection
Angle between incident ray and reflected ray = 70°
Angle of incidence + Angle of reflection = 70°
Since,
Angle of incidence = Angle of reflection
Angle of incidence + Angle of incidence = 70°
2 Angle of incidence = 70°
Divide 2 on both sides,
Angle of incidence = 70° / 2
Angle of incidence = 35°
Answer:
16
Explanation:
The atomic mass of an element is defined as the average of the isotopic masses, weighted according to the naturally occurring abundances of the isotopes of the element. Although oxygen has nine isotopes with mass numbers ranging from 13 to 21, oxygen-13, oxygen-14 and oxygen-15 are not naturally occurring isotopes. So, we do not need to include them when we calculate the relative atomic mass of oxygen.
The new electrostatic force will be 384 units.
The electrostatic force of attraction between two charges (charge of object 1) and (charge of object 2) separated by a distance d is given by
is the permittivity of free space.
Initially, we have,
Now, if the charge of object 1 is multiplied by 1, the charge of object 2 is multiplied by 3, and the distance separating objects 1 and 2 is divided by 4, we have, .
The new electrostatic force will be,
units.
We have,
Hence,
Hence, the new electrostatic force will be 384 units.
To read a similar problem on electrostatic forces visithttps://brainly.com/question/16049250