Fermi - A unit of length equal to 10-15 meter (one femtometer), used in nuclear physics. It is similar to the diameter of a proton.
17) Nuclear sizes are expressed in a unit named
Fermi
Related General Physics MCQ with Answers
distance
1 light year is equal to 9460730472580.8 km.
unequal heating of different parts of the atmosphere
The Above Phenomenon is a great example of TOTAL INTERNAL REFLACTION, Which comes in account when light travels from denser medium to rearer medium, after some specific angle it again reflacts into the denser medium. Similar kind of activity happens in desert area called Mirage or Marichica.
8 minutes
Speed of light = 3x108 m/s. Distance between the earth & the Sun is = 150000000 KM. So the time taken by light to cover this. Distance is = 150000000000 m/3x1108 m/s => 500 sec. /60 => 8 min. 20 sec.
the earth rotates from west to east
Earth revolve around the sun in anticlockwise direction and rotate about an its axis so the motion of earth is west to east with respect to star so according to the theorem of relativity we assume that star is moving east to west whenever the star is static with respect to earth and no one atmoshphere is moving.