(b)provide an opportunity of being heard to the assessee, [***] by serving upon him a notice to show cause within such time, as may be specified in the notice, being not less than seven days and but not exceeding thirty days from the date on which such notice is issued, or such time, as may be extended by him on the basis of an application in this behalf, as to why a notice under section 148 should not be issued on the basis of information which suggests that income chargeable to tax has escaped assessment in his case for the relevant assessment year and results of enquiry conducted, if any, as per clause (a);
