What was Chadwick's contribution to public health?
What will be an ideal response?
He aimed to improve sanitation and he was a reformer of public health. He worked to make sure that it was the government's responsibility to ensure protection of the public's health.
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If a wave has a frequency of 8 Hz, it has a period of _______.
a. 1/8 s. b. 8.5 s. c. 8 s. d. 4 s.
Which of the following wavelength regions cannot be studied at all with telescopes on the ground?
A) radio B) infrared C) x-rays D) both radio and x-rays E) both infrared and x-rays
Which of the following statements about the stages of nuclear burning in a massive star is not true?
A) Each successive stage creates an element with a higher atomic weight. B) As each stage ends, the core shrinks further. C) Each successive stage of fusion requires higher temperatures than the previous stages. D) Each successive stage lasts for approximately as long as the first, hydrogen fusion stage.
The closest star to the Sun is named
a. Polaris. b. Sirius. c. Betelgeuse. d. Proxima Centauri.