论文部分内容阅读
一、填空题 1.竖直上抛一物体(空气阻力不计),物体上升的最大高度是9米。物体上升到6米处的动量的大小跟刚抛出时的动量的大小之比等于__。物体上升到6米处的动能跟刚抛出时的动能之比等于__。 2.某收音机振荡电路的线圈的自感系数是300微享。电路中电流的表示式为i=141sin10~6πt毫安,此振荡电流的有效值为__毫安,频率为__,电路中电容器的电容为__。 3.电磁波有:可见光、红外线、紫外线、无线电波、γ射线、伦琴射线。若按频率由大到小的次序排列是___其中最容易表现出干涉、衍射现象的是__,穿透本领最大的是__。 4.氢原子处于量子数n=3的能级时的能量为-1.51电子伏特,当它从此能级向低能级跃迁时,可能放
First, fill in the blank 1. throw an object vertically (air resistance does not count), the maximum height of the object is 9 meters. The ratio of the momentum of an object up to 6 meters to the magnitude of the momentum just thrown is equal to __. The ratio of the kinetic energy of an object up to 6 meters to the kinetic energy just thrown is equal to __. 2. The self-inductance coefficient of the coil of a radio oscillation circuit is 300 micro-enjoying. The expression of the current in the circuit is i=141sin10~6πt milliamperes. The effective value of this oscillating current is __milliampere and the frequency is __. The capacitance of the capacitor in the circuit is __. 3. Electromagnetic waves: visible light, infrared rays, ultraviolet rays, radio waves, gamma rays, and roentgen rays. If the frequency is ranked from the largest to the smallest, it is __, which is the most likely to show interference and diffraction phenomena, and the greatest ability to penetrate is __. 4. The energy of a hydrogen atom when it is in the quantum number n=3 is -1.51 eV. When it is transitioned from this energy level to a low energy level, it may be released.