If a star that is 10 light-years away from Earth explodes, ...

[lindiwe]

If a star that is 10 light-years away from Earth explodes, gravitational waves from the explosion will reach Earth in
 
  A) less than 10 years.
  B) more than 10 years.
  C) 10 years.

Question 2

A very fine thread is placed between two glass plates on one side and the other side is touching to form a wedge. A beam of monochromatic light of wavelength 600 nm illuminates the wedge and 178 bright fringes are observed.
 
  What is the thickness of the thread? A) 22.3 m
  B) 26.7 m
  C) 32.3 m
  D) 53.3 m
  E) 76.3 m

[todom5090]

Answer to Question 1

Answer: C

Answer to Question 2

D