A researcher studies the light emitted by a distant star. The researcher finds that the light received from the star falls slightly closer to the red end of the electromagnetic spectrum when compared to a similar source closer to Earth. The researcher claims that the star is moving away from Earth. Is the researcher correct?
A No. All hot stars emit red-colored light.

B Yes. All moving objects emit red-colored light.

C No. The red-colored light emission is due to the composition of the star.

D Yes. Light from any object moving away from Earth shifts to red-colored light.

the movement of aircraft through clouds can even cause lightning strikes. a single lightning event is a "flash", which is a complex, multi-stage explosively ejected.

explanation:

and the person below goggled it.

mark as brainliest

considering the question as per the attachment

here we can see that the radon nuclide has 222 as the atomic mass number and 86 as the atomic number.

when it undergoes nuclear fission it gives polonium which has atomic mass number as 218 and atomic number will be 84 along with a helium nucleus which has 4 atomic mass number and 2 as its atomic number.

222 = 218 + 4 (atomic mass number)

86 = ? + 2; therefore ? = 86-2 = 84.

the atomic mass number of polonium will be 84.