Revenue will rise 13% to 16% in the second quarter, which runs through March, the company said Thursday during a conference call with analysts. That exceeded the 10% projected by Wall Street showing that Apple can maintain momentum after an iPhone-fueled sales surge in the December quarter. Still, the specter of rising memory prices clouded the results. After a minimal effect last quarter, the company expects more of an impact to gross margins in the current period, Chief Executive Officer Tim Cook said.