A stream of electrons passes through a velocity filter where the crossed magnetic and electric fields are 0.020 T and 5.00 × 104 V/m, respectively. Find the kinetic energy (in electron volts) of the electrons passing through the filter. [1 eV = 1.60 × 10?19 J]
What will be an ideal response?
17.8 eV
You might also like to view...
Two identical airplanes are executing identical turns around a pylon. One of them is moving at 200 mph, and the other is moving at 100 mph. The centripetal force acting on the airplane moving at 200 mph is __________ the value of the centripetal force acting on the airplane moving at 100 mph
a. one quarter b. one half c. the same as d. twice e. four times
Modern in-air nuclear bomb tests have created an extra high level of 14C in our atmosphere
If future archaeologists date samples from this era, without knowing of this testing, will their carbon-14 dates be too young, too old, or correct? If correct, why? A) Too young. B) Too old. C) Correct, since 14C from bomb tests is different from that produced naturally. D) Correct, because modern biological materials do not gather 14C from bomb tests.
Four identical point charges (+6.0 nC) are placed at the corners of a rectangle which measures 6.0 m × 8.0 m. If the electric potential is taken to be zero at infinity, what is the potential at the geometric center of this rectangle?
A. 58 V B. 63 V C. 43 V D. 84 V E. 11 V
Why does a particular gas cloud in the constellation Orion appear red?
A) The atoms in the cloud have electrons that are primarily red. B) The cloud must be made up of neon and nothing else. C) The cloud must be made of some element or elements that give off red emission lines. D) The solid metal inside the cloud is heated to 1000 Kelvin. E) The gas in the cloud is emitting all colors, but our telescopes only detect red light.