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please answer please please Please Respect thank you​

Please Answer Please Please Please Respect Thank You class=

Sagot :

Answer:

1. c

2. c

3. c

Explanation:

1. light changes velocity with the environment of the space or surface

2. the speed of light in vacuum is 299,792,458 m/s ---> approx 300,000,000 m/s

3. x-rays have the shortest wavelength among the four. radio waves have the longest wavelength

18.A

19.C

20.B

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