Hi pass says it passes higher frequency signals and blocks lower pass signals. This isn't typically a hard cutoff point but the lower frequency signals get attenuated over a frequency range. The R stands for resistance and C for capacitance such that these components are used to create the pass band for the circuit.
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ONE low pass(RC) circuit gives 60 degrees phase shift
Only frequencies in the pass band range will be allowed through the circuit. Other frequencies will be attenuated based on the RC values picked.
when the frequency is increased the total impedance of a series RC circuit is decrease.
RC Circuit
LC means coil capacitance circuit RC means resistance capacitance circuit