The Red-belly snake (Storeria occipitomaculata) is a relatively small snake that rarely exceeds 12 inches in length. It is native to North America, Mexico and Central America, and it is NOT venomous.
The electromagnetic frequency of a wave is defined as how many times the peak of this oscillation moves past a point each second. This has a major effect on the properties of the wave, including its energy.
emf is the theoretical value of the potential difference across the terminals of the battery. But every battery has some internal resistance which decreases that potential difference. The actual or observed p.d across the terminals of a battery is called terminal voltage of the battery.