Answer (a), (b), and (c). (a) briefly describe one specific historical similarity between mass media in the 1920s and in the 1950s. (b) briefly describe one specific historical difference between mass media in the 1920s and in the 1950s. (c) briefly explain one specific historical effect of mass media in either the 1920s or the 1950s

Mass media is a a form of technology which helps in reaching public at large via different means like newspapers, radio, television etc.

There are many historical similarities and differences between mass media during 1920s and in the 1950s. similarities are as follows:

(a) The era's during 1920s and 1950s were completely different from each other. The 1950s was a time after India gain independence and was a time of confidence and optimism whereas 1920s was a time of great depression.

However, mass media played a major role in both the era's as a medium for shaping opinion of public at large.

(b) The major difference between the mass media of 1920s and the 1950s was new technology. During 1920s mute movies and radios were in trend but with the passage of time new technology like television gain importance during 1950s.

(c) During 1950s , mass media played a vital role in shaping opinions of public at large and promoting optimism and freedom throughout the decade.

Therefore mass media is an important part of history and will keep on emerging as a great communicator of thoughts via different means.

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a. theta waves. this is because the person is in a light sleep which means the brain waves would show these kind of waves.