1.in an x-ray tube,electrons striking a target are brought to rest,causing x-rays to be emitted.in a particular x-ray tube,the maximum frequency of the emitted continuum x-ray spectrum is F0,if the voltage across the tube is doubled,the maximum frequency is?2.an object of mass M hands from a string that is fixed to the ceiling of a car.At the instant shown above,the car is moving into the plane of the page at constant speed V as it turns to the left a
1.in an x-ray tube,electrons striking a target are brought to rest,causing x-rays to be emitted.in a particular x-ray tube,the maximum frequency of the emitted continuum x-ray spectrum is F0,if the voltage across the tube is doubled,the maximum frequency is?
2.an object of mass M hands from a string that is fixed to the ceiling of a car.At the instant shown above,the car is moving into the plane of the page at constant speed V as it turns to the left around a horizontal curve of radius R.what is the correct expression for the angle G of the string with repsect to the vertical?
图就是一个小球M被一根右倾的绳子吊住,绳子和铅垂线成G角.
第一题。其实我是不会，查了一下。。貌似有hv=Ue的公式（没有能量损耗的前提下）（h为普朗克常量，v为所求波的频率，U为所加电压，e为电子电量）所以U加倍，v也应该加倍。。我怕误导你
第二题，horizontal curve 是什么？水平的弧线，我压力大。。repsect to the vertical 是什么。。猜不出来 总之，a=v^2/R F=Ma tanG=F/(Mg)=v^2/(Rg)
在x光管、电子引人注目的一个目标被带到休息,导致x射线被排出。在一个特定的x光管、最大频率的辐射连续F0 x射线光谱是,如果电压管倍,最大的频率是?
2。一个物体的大规模米用一根绳子,手固定在天花板上一辆汽车。在上面所示的瞬间,汽车进入飞机页面的恒速V因为它转向左边周围半径水平曲线r是什么
1.在X射线管中,电子射击固定的靶子,导致X射线的产生.在一个特定的X射线管,发出连续X射线谱的最高频率是Fo,如果在管子中的电压增加一倍,最高频率变为多少?根据普朗克定律E=hγ=QU=eU=Fo可得如果在管子中的电压增加一...