4) One cycle of the signal on the oscilloscope screen has width of 1.8 cm. The setting on the Horizontal TIME/DIV control is 5 s.

4) One cycle of the signal on the oscilloscope screen has width of 1.8 cm. The setting on the Horizontal TIME/DIV control is 5 µs. The period of the signal is                                                   and the frequency is            .

A)  1.5 x 10 ^-6 s; 650.2 kHz

B)   5.3 x 10 ^-6 s; 720.6 kHz

C)   9.0 x 10 ^-6 s; 111.1 kHz

D) 11.4 x 10 ^-6 s; 326.9 kHz