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Montano1993 [528]
2 years ago
10

The ordinary light microscope is called a bright-field microscope because _____.

Biology
2 answers:
Lapatulllka [165]2 years ago
6 0
A single light is made of
Zigmanuir [339]2 years ago
5 0

Answer:

The correct answer is option 2-the object appears dark on a light background.

Explanation:

Bright-field microscopy is the elementary or simple form of microscope used with compound microscopes. This is called a "brightfield" microscope because the specimen appears dark and contrasted in the bright light field.

For this specimen is placed on the stage of the microscope light source is then focused at the specimen. The condenser focuses the light on the specimen with the help of an aperture diaphragm. Light passes through the specimen which is collected by an objective lens which magnifies the light and transmits it to an eyepiece and to user's eyes. Some light is absorbed by dense areas, stains and pigments making specimen appear dark in bright light.

Thus, option 2-the object appears dark on a light is the correct answer.

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What is the difference between the null and alternative hypotheses? Give an example of each. How would you support or fail to su
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Answer:

Null Hypothesis:

The null hypothesis reflects that there will be no observed effect in our experiment. In a mathematical formulation of the null hypothesis, there will typically be an equal sign. This hypothesis is denoted by H0.

The null hypothesis is what we attempt to find evidence against in our hypothesis test. We hope to obtain a small enough p-value that it is lower than our level of significance alpha and we are justified in rejecting the null hypothesis. If our p-value is greater than alpha, then we fail to reject the null hypothesis.

If the null hypothesis is not rejected, then we must be careful to say what this means. The thinking on this is similar to a legal verdict. Just because a person has been declared "not guilty", it does not mean that he is innocent. In the same way, just because we failed to reject a null hypothesis it does not mean that the statement is true.

For example, we may want to investigate the claim that despite what convention has told us, the mean adult body temperature is not the accepted value of 98.6 degrees Fahrenheit. The null hypothesis for an experiment to investigate this is “The mean adult body temperature for healthy individuals is 98.6 degrees Fahrenheit.” If we fail to reject the null hypothesis, then our working hypothesis remains that the average adult who is healthy has a temperature of 98.6 degrees. We do not prove that this is true.

If we are studying a new treatment, the null hypothesis is that our treatment will not change our subjects in any meaningful way. In other words, the treatment will not produce any effect in our subjects.

Alternative Hypothesis:

The alternative or experimental hypothesis reflects that there will be an observed effect for our experiment. In a mathematical formulation of the alternative hypothesis, there will typically be an inequality, or not equal to symbol. This hypothesis is denoted by either Ha or by H1.

The alternative hypothesis is what we are attempting to demonstrate in an indirect way by the use of our hypothesis test. If the null hypothesis is rejected, then we accept the alternative hypothesis. If the null hypothesis is not rejected, then we do not accept the alternative hypothesis. Going back to the above example of mean human body temperature, the alternative hypothesis is “The average adult human body temperature is not 98.6 degrees Fahrenheit.”

If we are studying a new treatment, then the alternative hypothesis is that our treatment does, in fact, change our subjects in a meaningful and measurable way.

Hope this helps!

Explanation:

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