77. As the wavelength of an electromagnetic wave , the frequency of the wave 74. In a cathode-ray tube, the forces due the electric and magnetic fields are balanced for increases, increases c. increases, decreases electrons of a certain velocity. If the strength of the electric field is 275 N/C and that of the magnetic field is 0.025 T, what is the velocity of the electrons that pass through these fields decreases, decreases d. decreases, stays the same undeflected? 77. 78. A coil-and-capacitor circuit can transmit electromagnetic waves when it is connected to a(n) pendulum C. capacitor antenna d. magnetic field 74. 78. 75. An unknown particle is singly ionized and run through a mass spectrometer. The particle is accelerated by a potential difference of 50.0 V and passed through a magnetic field of 0.0450 T. The radius of the particle's path is 84.8 mm. What is the mass of the particle? For #79, write true or false. 79. A mass spectrometer can be used to separate different ions of an element. 79 . 80. The emission of X-rays can be described as an inverse photoelectric effect. What is the potential difference through which an electron accelerates to produce an X-ray with a wavelength of 0.10 nm? 76. A rarer isotope of the element from question 75 is run through a mass spectrometer on the same settings. It is found to have a mass of 2.51 x 10-26 kg. What was the radius of the isotope's path