i believe it's C but i'm not completely sure
Answer:
8 Hz
Explanation:
Given that
Standing wave at one end is 24 Hz
Standing wave at the other end is 32 Hz.
Then the frequency of the standing wave mode of a string having a length, l, is usually given as
f(m) = m(v/2L), where in this case, m could be 1. 2. 3. 4 etc
Also, another formula is given as
f(m) = m.f(1), where f(1) is the fundamental frequency..
Thus, we could say that
f(m+1) - f(m) = (m + 1).f(1) - m.f(1) = f(1)
And as such,
f(1) = 32 - 24
f(1) = 8 Hz
Then, the fundamental frequency needed is 8 Hz
Explanation:
Let are the number of turns in primary and secondary coil of the transformer such that,
A resistor R connected to the secondary dissipates a power
For a transformer,
...............(1)
The power dissipated through the secondary coil is :
.............(2)
Let are the new number of turns in primary and secondary coil of the transformer such that,
New voltage is :
...............(3)
So, new power dissipated is
So, the new power dissipated by the same resistor is 6400 watts. Hence, this is the required solution.