Parallax would be easier to measure if
a. Earth's orbit was larger.
b. the stars were farther away.
c. Earth moved faster along its orbit.
d. Earth's orbit was larger, the stars were further away, and Earth moved faster along its orbit.
e. None of the other choices are correct.
a
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A molecule of roughly spherical shape has a mass of 6.10 × 10-25 kg and a diameter of 0.70 nm
The uncertainty in the measured position of the molecule is equal to the molecular diameter. What is the minimum uncertainty in the speed of this molecule? (h = 6.626 × 10-34 J ? s) A) 0.78 m/s B) 7.8 m/s C) 78 m/s D) 0.078 m/s E) 0.0078 m/s
The {100} planes of a cubic unit cell form the ______________of the cube.
Fill in the blank(s) with the appropriate word(s).
I observe a galaxy that is 100 million light years away. Which of the following do I see?
A) the light from the galaxy as it is today, and it is redshifted B) the light from the galaxy as it was 100 million years ago, and it is redshifted C) the light from the galaxy as it is today, and it is blueshifted D) the light from the galaxy as it was 100 million years ago, and it is blueshifted E) Nothing: the galaxy lies beyond the cosmological horizon.
Why is it impossible for the mass of radioactive particles to decrease by half in radioactive decay after a half-life? Explain
What will be an ideal response?