Concepts Of Physics MCQ Edition [Volume 2]PhysicsElectric Current through Gases

Which of the following statements hold true for a cathode ray?

Options

AIt remains undeflected by a magnetic field.
BIt produces X-rays upon striking a metal.
CIt propagates in straight lines.
DIt constitutes an electromagnetic wave.

Correct answer

C. It propagates in straight lines.

Step-by-step solution

Cathode rays are streams of fast-moving electrons. Since they consist of negatively charged particles, they are deflected by both electric and magnetic fields. When high-energy cathode rays strike a heavy metal target, they cause the emission of X-rays. In the absence of any external electric or magnetic field, cathode rays travel in straight lines. Cathode rays are streams of particles and do not constitute electromagnetic waves. Thus, the statements that hold true are that they produce X-rays upon striking a meta

Practice Electric Current through Gases on Quantrex Academy →

More from Electric Current through Gases

A pure tungsten cathode and a thoriated-tungsten cathode share the same geometrical dimensions and are operated at a common temperature. The current produced by the thoriated-tungs Determine the ratio n(T)/n(1000 K ) for a tungsten emitter at temperatures T = 300 K , 2000 K , and 3000 K . Here, n(T) denotes the number of thermions emitted per second by the su Within a discharge tube, the mean free path of electrons in the gas is inversely proportional to the internal pressure. The Crookes dark space occupies half the length of the disch At 2000 K , the saturation current from a thoriated-tungsten cathode is 100 mA . Determine the saturation current for a pure-tungsten cathode that has the same surface area and ope Within a discharge tube filled with a gas, a molecule undergoes ionization, causing an electron to be detached. An electric field of 5.0 kV m ⁻¹ is present in the region of the eve Determine the factor by which the emission current changes when the temperature of a tungsten filament is increased from 2000 K to 2010 K . The work function of tungsten is 4.5 eV For tungsten, the constant A in the Richardson–Dushman equation is 60 imes 10^4 A m ⁻² K ⁻² , and its work function is 4.5 eV . An electric heater of 24 W is used to heat a tungste When the plate voltage is 36 V , the power delivered in the plate circuit of a diode is 1.0 W . Determine the power delivered if the plate voltage is raised to 49 V . Assume the La Full Electric Current through Gases list All Concepts Of Physics MCQ Edition [Volume 2] PYQs