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
Chemical=B
Mechanical=C
Nuclear=A
Electromagnetic=D
Thermal=E
I think these are right but if not I’m sorry
Hope I helped :]
Answer:
7 hours
Explanation:
The total charge contained in the battery is

And this is a charge, since it is a current multiplied by a time:

The current drawn by each headlight (which is the charge consumed per second) is

Since we have two headlight, the total current drawn is

Therefore, the total charge consumed by the two headlights each hour is

So, the time before the battery is dead is

Answer: I think the answer is B. Potential energy
Explanation:
Because the higher the ball is held up the more energy it has.
I hoped I really helped out. ;)