I do not know if it is correct but I think it is between B or C
The time it takes for a point to reach 0 displacement from maximum displacement is

of a cycle. Thus, one period (

) will take

.
The frequency is simply

.
The speed is given by:
Heat cause domains of magnets atoms to lose alignment
Answer:
Frequency is of light depends upon the body that emits it. While wavelength depends on the medium through which it travels in vacuum the product of wavelength and frequency is the same while in other mediums the light of higher wavelength travels faster besed on refractive index. So light velocity depends on both frequency and wavelength.
Explanation:
Answer:within the focal length of the lens, provided the focal length is shorter than the near point distance.
Explanation:Hope it helps