The_value_of_α_in_the_pass_band_of_constant_k-low_pass_filter_is?$#

• A. ‚âà√¨‚àö√ë
• B. ‚âà√¨‚àö√ë/4
• C. ‚âà√¨‚àö√ë/2
• D. 0