一道英文化学题Find the velocity of an electron emitted by a metal whose threshold frequency is 2.07×1014 when it is exposed to visible light of wavelength 5.24×10m.
问题描述:
一道英文化学题
Find the velocity of an electron emitted by a metal whose threshold frequency is 2.07×1014 when it is exposed to visible light of wavelength 5.24×10m.
答
波长太长,可见光的频率根本不能达到金属临界频率,不能激发出光子。所以没有速度!
光的频率=光速/光波长=3*10^8/52.4
答
临界频率是 2.07×1014 的金属暴露到波长为5.24×10m目视可见光时,发出的电子的速度是多少?
物理题目俺不会做