Answer:
Yes, ink chromatography can be used by the teacher to find out whether or not a student has changed answers after a test has been graded.
Explanation:
Ink chromatography is a procedure of separating out of the desired ink from the mixture of various other types of inks or dyes. When any ink is mixed with any solvent meant for it, then it dissolves and may be distinguished from the other ink. Also another fact is helpful, which indicates that some ink are water soluble and some are alcohol soluble. Different types of ink pen uses various types of inks, when this is mixed with certain solvents the components of the mixture thus obtained forms a banding pattern which is very unique to that particular. This is also called ink chromatograph.
Answer: A focal spot in the x-ray setup is the area of the anode surface which receives the beam of electrons from the cathode. It is the apparent source of x-rays.
Below are some of the factors that affect its size.
Explanation:
Size of the focal spot depends on
* angle of the anode
Other prime factors that affect x-ray emission; under the control of the radiographer includes;
• Miliamperage-second (mAs)(tube current measurement)
• Kilovoltage (kVp) Controls both the quantity and quality of the x-ray beam with the speed and energy.
• Distance (d) - Related to tube design and construction.
• Tube housing
• Target material
• Filtration
• Voltage waveform
<span>A method of deducing the correct species
assignment of a living thing is known as dichotomous key, which is also called
identification key. It works by requiring a user to choose two alternatives at
each step and the choice of one alternatives give the name of the organism or
direct further down in the key. However, a common error in using dichotomous
key is the assumption that the correct name or identification of the organism
is even included in the set of key. Therefore, this method alone is not reliable
to identify specific species.</span>
Answer: The correct answer is #3. Dogs and humans are more closely related than snakes and humans
