Gamma rays are produced by applying?
Electric and magnetic fields at right angles to each other.
electric and magnetic fields parallel to eachother
Crests and troughs at right angles to eachother
crest and troughs parallel to eachother

Electric and magnetic fields at right angles to each other.

Explanation:

Gamma rays like any other electromagnetic waves are simply produced when electric and magnetic fields are oriented at right angles to each other.

These waves produced in this unique way are called electromagnetic waves.

Electromagnetic waves do not require a material medium for their propagation in nature as they move in vacuum and other forms of matter.

Other examples of these waves are x-rays, visible light, infra-red, ultraviolet e.t.c

All of these are produced when electric and magnetic fields are oriented at right angles to one another.

the first phase of the government’s plan for settlement was building the transcontinental railroad. the railroad provided a way to bring settlers and manufactured goods west and ship their agricultural and mining produce east. the transcontinental railroad was an essential artery for rapid development of the frontier.

the second phase of the government’s plan was a liberal land distribution policy that made it possible for many people to homestead. with these two key elements—transportation and cheap land—the government rapidly achieved its goal of persuading people to move west, settle on farms, and push back the frontier.