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Out of the following, choose the ray which does not travel with the velocity of light in vacuum
O X-rays
Microwave
gamma -rays
O beta-rays​

Answer 1

The ans is beta rays because, beta rays are not a form of electromagnetic wave but are a result of beta decay from elementary particles

Answer 2

Explanation

x rays =An X-ray, or, much less commonly, X-radiation, is a penetrating form of high-energy electromagnetic radiation. Most X-rays have a wavelength ranging from 10 picometers to 10 nanometers, corresponding to frequencies in the range 30 petahertz to 30 exahertz and energies in the range 145 eV to 124 keV.

microwave=Microwaves are defined as electromagnetic radiations with a frequency ranging between 300 MHz to 300 GHz while the wavelength ranges from 1 mm to around 30 cm. The microwave radiation is commonly referred to as microwaves. They fall between the infrared radiation and radio waves in the electromagnetic spectrum

gama rays=A gamma ray, also known as gamma radiation, is a penetrating form of electromagnetic radiation arising from the radioactive decay of atomic nuclei. It consists of the shortest wavelength electromagnetic waves, typically shorter than those of X-rays.

beta rays=A beta particle, also called beta ray or beta radiation, is a high-energy, high-speed electron or positron emitted by the radioactive decay of an atomic nucleus during the process of beta decay. There are two forms of beta decay, β⁻ decay and β⁺ decay, which produce electrons and positrons respectively.

there fore,

The ans is beta rays because, beta rays are not a form of electromagnetic wave but are a result of beta decay from elementary particles

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