Question

Cathode Rays are

• A. Radiations
• B. Stream of Electrons
• C. Stream of Alpha Particles
• D. Electromagnetic Waves

Answer 1

The correct option is B

Stream of Electrons

The explanation for the correct option:

In the case of option (B)

1. The cathode rays are deflected when electric and magnetic fields are applied to the cathode ray in the discharge tube, indicating that they are made up of charged particles.
2. The deflection direction reveals that cathode rays are made up of negatively charged electrons.
3. Therefore, cathode rays are streams of electrons.

Hence. option (B) is correct.

The explanation for incorrect options:

In the case of option (A)

1. The energy that originates from a source and moves through space at the speed of light is referred to as radiation.
2. This energy has wave-like characteristics and is accompanied by an electric field and a magnetic field.

Hence, option (A) is incorrect.

In the case of option (C)

1. A stream of alpha particles is a positively charged nuclear particle identical to the nucleus of a helium atom that consists of two protons and two neutrons and is ejected at high speed in certain radioactive transformations.
2. Cathode rays are generated through gases at low pressure and high voltage.

Hence, option (C) is incorrect.

In the case of option (D)

1. Electromagnetic waves or EM waves are waves that are created as a result of vibrations between an electric field and a magnetic field.
2. In other words, EM waves are composed of oscillating magnetic and electric fields.

Hence, option (D) is incorrect.