Answer:
Option D
+2
Explanation:
We know that Calcium has 20 electrons and 20 protons. It lost two electrons, it has 20 protons, but only 18 electrons. This makes calcium a positive ion with a charge of +2.
Because of a difference in temperature.
Complete question:
standard 14.16-inch (0.360-meter) computer monitor is 1024 pixels wide and 768 pixels tall. Each pixel is a square approximately 281 micrometers on each side. Up close, you can see the individual pixels, but from a distance they appear to blend together and form the image on the screen.
A) If the maximum distance between the screen and your eyes at which you can just barely resolve two adjacent pixels is 1.30 meters, what is the effective diameter d of your pupil? Assume that the resolvability is diffraction-limited. Furthermore, 550*10^-9m as a characteristic optical wavelength. Express your answer in millimeters to three significant figures.
B.) Assuming that the screen is sufficiently bright, at what distance can you no longer resolve two pixels on diagonally opposite corners of the screen, so that the entire screen looks like a single spot? Note that the size (0.360 meters) quoted for a monitor is the length of the diagonal. Express your answer in meters to three significant figures.
Answer:
a) 3.1mm
b) 1663m
Explanation:
Given:
Screen resolution =1024*768 pixel at approximately 281m each
a) Let's take sin∅ =
Solving for d we have:
d = 3.10mm
b) given:
y = 0.360m
We now have d= 3.1mm
To find L, we use:
L = 1663m
Answer:
oa
Explanation:
it may be oa is the right answer for this question
but I don't know properly
Answer:
Explanation: divide 280 by 68 which would = 4 I think