. using the balmer formula (equation 1), calculate the n = 7 wavelength for the hydrogen spectrum. why was this wavelength not observed in the laboratory?

Much of the general structure and physical properties of the interior of the earth are inferred from: a)deep oil and gas bore holes b)geologic investigations c)analysis of seismic waves d) study of volcanoes

Miner's coal distributors does not mine coal itself, nor does it even store or handle the coal. instead, miner's solicits orders for low sulfur coal from other firms, then purchases the required amount from suppliers and directs them to ship the coal to its customers. what is miner's

When a device is used in a circuit in which the voltage is 81 v the current flowing through the device is 3 a what is the resistance of the device