Assuming the time lapse indicated by the double arrow is 2s, what are the values of the wave frequencies f1 and f2 in the figure? (Hint: Use the definition of frequency).

f₁ = 1 Hz

f₂ = 0.75 Hz

Explanation:

The given time lapse between the two frequencies, t = 2 s

The frequency of a wave is the number of complete one cycles of the wave that pass through a given point in a given unit of time

The unit of frequency, 'f', is the Hertz, Hz

Therefore, frequency = Number of cycles/(Time)

The frequency of a wave, f = n/t

Where;

n = The number of completed cycles in a given time

The frequency of the first wave 1, f₁

The number of complete cycles by wave 1 in the 2 seconds, n = 2 cycles

The time, t = 2 seconds

The frequency of wave 1, f₁ = 2 cycles/(2 seconds) = 1 cycle/second = 1 Hz

The frequency of the second wave, wave 2, f₂

The number of complete cycles by wave 2 in the 2 seconds, n = 1 and half cycles = 1.5 cycles

The time, t = 2 seconds

The frequency of wave 2, f₂ = 1.5 cycles/(2 seconds) = 0.75 cycle/second = 0.75 Hz

the answer is the first electromagnet (a). this is because it has more coils around the ferromagnetic material. increasing the number of coils increases the surface area in which the metal interacts with the current in the coil. this enables more atoms in the metal to become aligned hence becoming more magnetized.