A plane electromagnetic wave is given by $${E_0}\left( {{\bf{\hat x}} + {e^{i\delta }}{\bf{\hat y}}} \right)\exp \left\{ {i\left( {kz - \omega t} \right)} \right\}.$$ At a given location, the number of times $$\overrightarrow {\bf{E}} $$ vanishes in 1s is
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