The question asks about the direction of cathode rays in a discharge tube. This requires understanding the basic principle of how a cathode ray tube works, specifically the roles of the cathode and anode, and the nature of cathode rays.
Correct Option: C) Cathode, anode
The question asks about the phenomenon responsible for producing images on a television screen, which is essentially a Cathode Ray Tube (CRT). The screen is coated with fluorescent or phosphorescent materials. We need to identify the correct physical process that causes light emission when these materials are struck by electrons.
Correct Option: A) Fluorescence. Television pictures are formed due to the fluorescence (or phosphorescence) of the screen coating when struck by electron beams.
This question tests fundamental knowledge about the constituents of atoms and the historical experiments that led to their discovery. Specifically, it refers to cathode rays, which were crucial in identifying a subatomic particle.
C) Electrons — Cathode rays are streams of negatively charged particles, which were identified as electrons by J.J. Thomson. This discovery was a cornerstone in understanding atomic structure.
The question asks about the fundamental building blocks that electrons constitute. To answer this, we need to recall the basic structure of matter and the role of subatomic particles like electrons, protons, and neutrons.
D) Atoms — Electrons are fundamental subatomic particles that, along with protons and neutrons, make up all atoms. Atoms are the basic building blocks of all matter.
The question asks to identify the correct statements regarding J.J. Thomson's experiment on the deflection of cathode rays (electrons) in electric and magnetic fields. This experiment was crucial in determining the charge-to-mass ratio of the electron. The deflection of a charged particle in an electric or magnetic field depends on several factors, which are described in the given statements.
B) All a,b,c,d — As analyzed, all four statements correctly describe the factors affecting the deflection of charged particles (electrons) in electric and magnetic fields, which were central to J.J. Thomson's experiments.
The question asks for the charge of an electron in Coulombs (C). This is a fundamental constant in physics and chemistry. We need to recall the standard value and sign of an electron's charge.
Correct Option: A) \(-1.6 \times 10^{-19}\) C is the correct value for the charge of an electron.