Answer:

Explanation:
Given that,
A system can detect objects as small as 19.1 cm i.e. 0.191 m. It is the wavelength.
We know that,
Frequency, 
So,

So, the frequency of such a system is equal to
.
Average speed = total distance/total time.
Answer:
all objects in the universe.
Answer: Option (A) is the correct answer.
Explanation:
Since Robert has a history of depression this means that he is mostly worried about his image in his family and friends because everyone wants to look good in everybody's eyes.
Similarly, Robert also wants to be treated fairly well by everyone around him as he wants that everybody consider him normal.
Thus, Robert’s apprehension to get help is an example of a fear of being stigmatized.