Tokyo stocks rose sharply Wednesday morning, as investors took heart from the yen’s weakness against the U.S. dollar to buy exporters, lifting the Nikkei to a new 34-year intraday high for a second trading day. The 225-issue Nikkei Stock Average rose 623.61 points, or 1.85 percent, from Tuesday to 34,386.79. The broader Topix index was up 31.25 points, or 1.30 percent, at 2,444.34. On the top-tier Prime Market, gainers were led by precision instrument, pharmaceutical and electric appliance issues.