C. 340
Frequency is the number of wavelengths per second and since the length is 0.5 you multiply 0.5*686 and get 343.
the question not allowing for one position thus the answer is c
Answer:
what does your parents do at home
Example
A person who is adamant about something has formed an opinion or taken a position that is not going to change because the person is determined to keep that opinion or position. ... The noun adamant comes from a Latin word meaning "material of extreme hardness, diamond
1kg = 1000000000 micrograms
I hope it helps you ;)
I believe it is velocity, acceleration is in m/sec^2
