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如图所示，带电粒子（不计重力）以水平初速度v0从a点垂直进入匀强磁场，匀强磁场方向垂直纸面向里，运动中粒子经过b点，且oa=ob.若撤去磁场加一个与y轴平行的匀强电场，粒子仍以相同的v0从a点进入电场，粒子仍能通过b点，那么电场强度E与磁感强度B的大小之比为（ ）
Based on the figure, does S depend on the frequency of a sound wave of a given intensity? A.Yes, because as frequency increases, S increases. B.Yes, because as frequency increases, S remains constant. C.No, because as frequency increases, S increases. D.No, because as frequency increase...
We use the model, tested against the field data, to explore the sensitivity of woodland tree populations and biomass to fire intensity and frequency.The fire experiments show that large (>5 cm dbh) stems are vulnerable to fire, with top-kill rates of up to 12% in intense fires. In ...
a"If the image of the LED in the viewfinder does not change its intensity while the LED is blinking with a certain frequency, this frequency is the display refresh rate" “如果LED的图象在反光镜不改变它的强度,当LED眨眼睛以有些频率时,这个频率是显示补充给养率”[translate]...
Refraction is a phenomena in which a light or a wave is deflected when passing from a medium to another medium, from air to glass, air to water, water to glass, etc. The deflection or how bend the light from its normal path depends on the index of refraction...
Meta-regression of weight lost in control groups. Does intensity of brief advice or frequency of follow-up lead to greater weight loss?To systematically review the literature and conduct a meta-analysis on randomised controlled trials that have compared meal replacement intervention with a comparative...
This in turn helps to dilute the levels of free radicals in the body thus allowing the body to function better. As a result, it helps reduce your body’s risk for arteriosclerosis. This process happens with the help oflight.Lighttherapycan be done by the use of either a low intensity la...
Recent concurrent processes of vegetation greening and reduced resilience (the capacity to recover from disturbances) worldwide have brought many uncertainties into sustainable ecosystems in the future. However, little is known about the conditions and e
One solution to this for moderately affected listeners is to decrease the ANC intensity. This can often be done in many headphone companion apps. Another solution is to buy a pair of noise canceling headphones thataren’t at the top of the class. The sub-optimal ANC may be frustrating or...