Answer:
Radius of the outer most dark fringe is 2.65 cm
Solution:
As per the question:
Radius of curvature of the glass, r = 10.8 m
No. of dark fringes, n = 100
Wavelength of light,
Now,
To calculate the radius R of the outermost ring:
Radius of the dark fringe of nth order is given by:
14. Answer;
-There are two potassium ions for each ion of sulfur.
Explanation;
The formula K2S indicates that there are two potassium ions for each ion of sulfur.
-K2S is the formula of potassium sulfide.
- From the formula; two potassium atoms combines with 1 atom of sulfur to form the compound. In other words the ratio of potassium and sulfur atoms in the compound is 2 : 1.
15. Answer;
-Lithium fluoride
Explanation;
-Fluorine, F, forms a binary ionic compound with lithium, Li. The name of the compound is lithium fluoride.
- A compound is a substance that is formed when two or more atoms from different elements are chemically bonded. For example Lithium fluoride is a compound that is made of fluorine atom and lithium atom that are chemically combined.
16. Answer;
-Carbon-12 atom
Explanation;
The standard on which the atomic mass unit is based is the mass of a carbon-12 atom.
-Atomic mass is the quantity of matter contained in an atom of an element. -The atomic mass is expressed as a multiple of one-twelfth the mass of the carbon-12 atom, which is assigned an atomic mass of 12 units.
17. Answer;
- Non-metal fluorine
Explanation;
-Two highly reactive elements in Period 2 are the metal lithium and the non-metal fluorine.
-Elements in period 2 often have the most extreme properties in their respective groups. Fluorine is the most reactive halogen, neon is the most inert noble gas, and lithium is the least reactive alkali metal, but the most reactive metal in group 2.
Answer:14 m
Explanation:
Given
Vertical jump make by the dolphin is given by
Suppose the dolphin jump with an initial velocity of
so u is given by
If dolphin launches at an angle then maximum horizontal range is given by
assuming the of Dolphin to be Projectile so range is given by
substitute the value of
Range will be maximum for
thus
<span>The UK government wants to reduce its carbon dioxide emissions. It also wants to increase the amount of energy which comes from renewable sources.</span>
Answer:
C. The concentration of the copper sulfate is too low
Explanation: