1. Radio amateurs are permitted to communicate on the "10-km band". The frequency of radio wave corresponding to a wavelength of 10 km is a. 333 MHz b. 30 KHz c. 300 KHz d. 33 MHz 2. A radio station broadcast at a frequency of 660 kHz. The wavelength of these waves is a. 2.2 mm b. 455 m c. 1.98 x 10^14 m d. 4.55 km

1. Radio amateurs are permitted to communicate on the "10-km band". The frequency of radio wave corresponding to a wavelength of 10 km is a. 333 MHz b. 30 KHz c. 300 KHz d. 33 MHz 2. A radio station broadcast at a frequency of 660 kHz. The wavelength of these waves is a. 2.2 mm b. 455 m c. 1.98 x 10^14 m d. 4.55 km