During a lab, a student tapes a ruler to a lab table and sets the ruler in motion. a laser detector pointed at the ruler records how many times the ruler vibrates back and forth in a period of time.

what is the order of trials from least to greatest pitch?

one; two; three; four
one; two; four; three
three; one; two; four
four; two; one; three

Four; Two; One; Three

Explanation:

During a lab, a student tapes a ruler to a lab table and sets the ruler in motion. A laser detector pointed at the ruler records how many times the ruler vibrates back and forth in a period of time.

Pitch or frequency is defined as the number of cycles per unit time. We can calculate the pitch for each trials i.e.

Trial one,

Trial two,  

Trial three,  

Trial four,        

Hence, the order of the trials from least to greatest pitch is :

Trial four, Trial two, Trial one and Trial three i.e. option (d) is correct.                        

so easy. just google the electromagnetic waves and it’ll pop up.