I need an answer ASAP

1 answer:

8 0

Time taken for star to reach Earth = 7.5 years

<h3>Further explanation</h3>

Given

7.5 light years(distance Earth-star)

Required

Time taken

Solution

Speed of light=v = 3 x 10⁸ m/s

1 light years = 9.461 × 10¹⁵ m= distance(d)

So time taken for 1 light years :

time(t) = distance(d) : speed(v)

t = 9.461 × 10¹⁵ m : 3 x 10⁸ m/s

t = 3.154 x 10⁷ s = 1 years

So for 7.5 light years, time taken = 7.5 years

You might be interested in

Advocard [28]

Sedimentation and Decantation is the process of setting of solid particles from a liquid either to produce a concentrated slurry or to clarify a liquid containing solid particles . The solid must not be mixed with liquid. For example- sand insoluble in water
Sublimation - In this process solid phase is directly transformed into vapour form without passing through liquid phase.This method is used in the purification of those substances which have sublimation property. At first the mixture should be sublimed before dissolution in liquid.
EX- Iodine , naphthalene, ammonium chloride etc. Here, NH4Cl is seperated by sublimation.
Evaporation is a technique used to separate out homogeneous mixtures where there is one or more dissolved salts. The process convert the liquid components from the solid components. The process typically involves heating the mixture until no more liquid remains.
so, now by evaporation of the liquid solvent we finally get the salt that was dissolved in it that is NaCl.

To know more about Sedimentation visit :brainly.com/question/22443465

#SPJ4

8 0

2 years ago

Advocard [28]

A. because a chemical change is something that's changing

7 0

3 years ago

Zielflug [23.3K]