![]() ![]() The same that happens to the Doppler effect is very common in psychosocial sciences (e.g. Validity is common in areas of knowledge that use indirect measures. ![]() In this case, we have the problem of the validity of an instrument, because we need to know if it’s true or not that the distance between spectral lines is related to speed. For example, if we are measuring speed using the Doppler effect, where approximation/distance of spectral lines of galaxy lights is the instrument. However, there are some cases that this is not that clear. Therefore, there’s no need to prove that this property is congruent with the same property of the object being measure. length) to measure the length of another object. ![]() For example, an instrument that measures length uses this property (i.e. In physics, we often have an instrument that exists physically and measures physical properties. ![]()
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