A nonrelativistic electron is accelerated from rest through a potential difference. After acceleration the electron has a de Broglie wavelength of 880 nm
What is the potential difference though which this electron was accelerated? (h = 6.626 × 10-34 J ? s, e = -1.60 × 10-19 C,
mel = 9.11 × 10-31 kg)
A) 1.9 µV
B) 1.7 µV
C) 2.2 µV
D) 2.5 µV
Answer: A
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The vast flood deposits support the hypothesis that Mars once had much running water. Assuming that Mars did have water once, what happened to it?
What will be an ideal response?
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