Top to bottom: Lights flashing at frequencies, 1 Hz and 2 Hz; that is, at 0.5, 1.0 and 2.0 flashes per second, respectively. The time between each flash – the period T – is given by 1⁄f (the reciprocal of f); that is, 2, 1 and 0.5 seconds, respectively.

Town in Playas de Rosarito Municipality, Baja California, located on the Pacific Coast of Mexico.

- Puerto Nuevo, Baja California

XESS-AM (620 kHz) is a commercial AM radio station, licensed to Puerto Nuevo, Baja California, and serving the Tijuana-San Diego radio market.

- XESS-AM

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