Answer: star
Exoplanets are the planets present in the other star system. There are billions of stars in our galaxy and we expect presence of other planetary systems similar to our solar system. Exoplanets can be detected by a) radial velocity method b) astrometric method c) transient method. In the radial method, we observe the changes in the spectrum of the light coming from star when an exoplanet is orbiting it. There is change in gravitational pull as the planets goes around the star. It sometimes pulls into smaller orbit. like this the star wobbles back and forth. By measuring the blueshift and redshift in the star's spectrum, exoplanet can be discovered.
Answer:
C) 5 moles of Argon (Ar)
Explanation:
5mol Na x 22.990g Na/ 1 mol Na = 114.95g Na
5mol P x 30.974g P/ 1 mol P = 154.87g P
5mol Ar x 39.948g Ar/ 1 mol Ar = 199.74g Ar
Therefore Ar has the greatesr mass.
The formula you need is: heat= specific heat x mass x ΔT
specific heat= 0.46 j/g-C
mass= 100.0 grams
ΔT= 40.2 - 15.0= 25.2C
heat= (0.46) x (100.0) x (25.2)= 1159.2 joules or 1200 joules (rounded off)
Answer:
+2
Explanation:
Because an electron has a negative charge.
