Answer:
Solution
The atomic number of iodine (53) tells us that a neutral iodine atom contains 53 protons in its nucleus and 53 electrons outside its nucleus. Because the sum of the numbers of protons and neutrons equals the mass number, 127, the number of neutrons is 74 (127 − 53 = 74). Since the iodine is added as a 1− anion, the number of electrons is 54 [53 – (1–) = 54].
Check Your Learning
An ion of platinum has a mass number of 195 and contains 74 electrons. How many protons and neutrons does it contain, and what is its charge?
Answer:
78 protons; 117 neutrons; charge is 4+
Answer:
A) I = Io 0.578, B) he light that leaves the polarized is completely polarized, being perpendicular to the axis of the second filter
Explanation:
A) Light passing through a polarizer must comply with the / bad law
I = Io cos2 tea
Where is at the angle of the polarizer and incident light
I = Io cos2 45
I = Io 0.578
Therefore the beam intensity is 0.578 of the incident intensity
.B) the light that leaves the polarized is completely polarized, being perpendicular to the axis of the second filter
Alright. If it’s running at a constant speed of 120 km/h, in one hour it will have traveled 120 kilometers. hence “kilometers per hour”
20 minutes is 1/3 of an hour so 120/3 will be 40
therefore, in 20 minutes the cheetah would’ve ran 40km if it maintained 120km/h for 20 minutes.
Answer: D) none of the above
Explanation: This is a classic problem of thermodynamics, and refers to the principle of conservation of energy to give a correct answer
Option A) can be ruled out since no matter how much friction is reduced, it will always exist and therefore some energy will be lost
option B) and C) are out of context since the loss of work or energy will continue to exist even if those values are modified, so they do not answer the question
D) is the correct one since it should be said that this is not possible (so far...) as it goes against the conservation of energy and this option is none of the above
Answer:
The digestive system provides nutrients to the body by breaking down food.
