Two eagles fly directly toward one another, the first at 14 m/s and the second at 21.5 m/s. Both screech, the first one emitting a frequency of 3400 Hz and the second one emitting a frequency of 4050 Hz. What frequencies do they receive if the speed of sound is 330 m/s?

The answer would be a

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.