The ____________ of a radioactive substance is the amount of time for the substance to be reduced by half

Fill in the blank(s) with correct word


half-life

Physics & Space Science

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What is a possible reason why Venus does not have plate tectonics?

A) it is too small B) its crust is too dry and stiff to break into plates C) it has no partially molten iron core D) Both A and B

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The discovered that the orbits of planets are ellipses.

What will be an ideal response?

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Two adjacent sources each emit a frequency of 800. Hz in air where the velocity of sound is 340. m/s. How much farther back would the first source have to be moved so an observer in front of the sources would hear no sound?

What will be an ideal response?

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An 800-N man stands at rest with his weight evenly distributed on two bathroom scales. The reading on each scale is

A) 200 N. B) 400 N. C) 800 N. D) 1600 N. E) none of the above

Physics & Space Science