40.Ferhatikan grafik gelombang berikut Tentukan d. Periode gelombang b. Frekuersi gelombang c. Panjang gelombang d. Cegat rambat galombang

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To answer the question, we need more information. Since there is no wave graph provided, elements such as the wave period, frequency, wavelength, and wave propagation speed cannot be determined. The wave period is defined as the time it takes for a wave to pass a certain point. Frequency is the number of vibrations in one second and is usually measured in Hz. Frequency and period are related to each other. The wavelength is defined as the distance between two peaks in a wave, specifically the distance traveled by a wave with one complete cycle. However, -2 am seems to be a typing error. Wave propagation speed tends to mean the speed of sound, depending on the density of the wave's medium. In this case, -2am does not provide us with any useful information.