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The answers for the above mentioned questions is,

1) X-rays (option D)

2) modern medical x-rays use stronger radiation than earlier types. (option D)

3) Radio waves have high frequency (Option B)

4) Gamma radiation (Option A)

5) Infrared radiation (Option B)

6) Radio waves (Option A)

Explanation:

Wireless networks are invisible radio waves, a form of radiofrequency radiation, via the air related to cellphones, computers, Bluetooth speakers, and other WiFi-enabled devices. Non-ionizing EMF is low-level radiation which is commonly observed as safe.  The infrared spectrum helps to study things that are too chilled to transmit evident light, such as planets, circumstellar disks or nebulae whose light is obstructed by dust. Hence we can conclude that Infrared radiations are the electromagnetic radiations used in optical telescope.

Hey how did you manage to type such a big lab report

B. a graduated substance