1 point 1. The Hertzsprung-Russell diagram below shows how the brightness,
surface temperature, and color of stars are related. Which of these
observations of Barnard's Star is most likely accurate?
Hertzsprung-Russell Diagram
Blue
10,000 suns
Supergants
Red
100 suns
White
Gants
Brightness
Orange
0.0 Sun
oo
OO
owheats
OO
Barnard's Star
Red
50,000 25,000 11.000 7,800 6.300 5,300 1,800
Surface Temperature (K)
A Barnard's Star is less bright than the sun has a surface temperature below 3,800 K,
and is red
B Barnard's Star is less bright than the sun, has a surface temperature above 3,800K,
and is red
C Barnard's Star is brighter than the sun, has a surface temperature below 5,300 K
O and is llow. Barnard's Star is brighter than the sun, has a surface temperature
above 5,300 K, and is yellow
D Barnard's Star is brighter than the sun, has a surface temperature above 5,300 K
and is yellow

The scheme below is from a series of reactions that are part of a synthesis of vitamin a. answer the following questions with reference to this scheme. (i) what is "reagent a"? (ii) draw a step-by-step mechanism which explains the formation of compound c from compound b (iii) which reagents would you use to form compound e from compounds c and d (reagents b and c)? for each reagent suggested above in (ii) explain the role of the reagent in the reaction to (iv) form compound e. you may wish to do this by drawing a mechanism. 1. addition of reagent a но reagent a 2. н,о" thо oh нон-с compound a. compound b. compound c .ch-оh 1. reagent b "сно 2. reagent c сh oh compound e. compound d.

Which of the following are good traits of a hypothesis? it will be able to be testedit can predict an outcomeit will explain the observationsall of these

What is the relationship between wind and ocean waves? question 17 options: wind moving at higher speeds will transfer more energy to the water, resulting in stronger waves. wind moving at higher speeds will transfer energy over a larger part of the ocean water, resulting in waves with a shorter wavelength. winds moving at higher speeds with cause water to move forward at faster rates, causing larger ocean waves. winds moving at higher speeds will affect deeper water, resulting in waves that move at a faster rate. how do temperature and salinity affect deepwater currents? question 15 options: as temperatures and salinity levels of water increase, the water rises to the surface where it creates currents as it moves to colder regions. they create changes in wind direction, moving denser water in the same direction as the wind and causing the deepwater circulation patterns found in the ocean. they equalize the forces on undersea currents caused by the coriolis effect as they replace more dense water with less dense water. they create density differences that cause dense deepwater currents to flow toward the equator where they displace less dense, warmer water above them.