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Is Black all colors or no colors?

Black would be no colours. the way we see things, is that light bounces off a surface, and into our eyes. The colour of the surface decides the colour of the light that is bounced into our eyes, and allows us to tell what colour it is. If there either isn't any light, or nothing that bounces in our direction, then we'll see the absence of light as black.


Are true or false questions ordinal or nominal?

True or false questions are considered nominal because they categorize responses into two distinct groups without any inherent order. Each response represents a different category (true or false) without implying a ranking or sequence. In contrast, ordinal questions would involve a ranking or order among the answers, which is not applicable here.


If p is false q is false and r is true is true?

In propositional logic, if we have statements p, q, and r, and we know that p is false, q is false, and r is true, the overall truth of a compound statement involving these variables would depend on the specific logical connectors used (such as AND, OR, NOT). For example, if the statement is "p AND q AND r," the result would be false, as both p and q are false. However, if the statement is "p OR q OR r," the result would be true because r is true. Thus, the truth value of the overall statement cannot be determined without knowing its specific form.


What is the difference between reagent blank and sample blank?

Reagent Blank : Take reagent and add deionised water (in place of sample to be tested). Now measure the OD at specific wavelength --> this OD is your reagent blank. Substract this OD from your test result (with sample) to avoid any false +ve effect due to colour of reagents itself.Sample Blank : Take sample and measure the OD without adding reagents --> this OD is your sample blank. Substract this OD from your test result to avoid any false +ve effect due to colour and turbidity of sample itself. As it is the fact that colour and turbidity of each sample would vary from one to another.So now it is clear that Reagent blank is used to avoid bias due to colour of reagents and Sample blank is used to avoid bias due to sample itself.


What is better a 4000 kelvin light or 5000 kelvin?

5000