Determine the current of a circuit if an ammeter measures 3C of charge in .5 seconds

Wavelength divides in half and speed stays the same.

Year  1936,  lehman predicted that the earths 'inner core' is solid. she observed that the seismic signals during her study were bent and did not pass through instead bouncing back. later it was confirmed that the earth's inner core was solid made up of nickel-iron and had a molten outer core.

B. that is the answer