[填空题]
In Problem 59, the le(lr5dx ia8 l8fngth of the sl4+ubt1 x ax6 qo -rsu 4533njzggojp:tring may be adjusted by moving the pulley. If the j4u:+5g63qto3z 1u g-lp xxs 4oabr jnhanging mass m is fixed at 0.080 kg, how many different standing wave patterns may be achieved by varying L between 10 cm and 1.5 m?