In a double-slit experiment, when both interference and diffraction are taken into account, which is the lowest order maximum that is missing in the case where the slit separations is 0.020 mm and the slit widths are each 0.005 mm?
A. 1
B. 2
C. 3
D. 4
E. no order is missing
D. 4
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Galileo proposed that the Sun is a rotating sphere after he ____
a. noted how the Sun rose in the east and set in the west b. discovered the parallax of the Sun c. timed a full rotation of the Sun's equator d. observed sunspots move across the surface of the Sun e. measured different spectral lines of emission on different days
Choose the correct word(s) that make the statement true. The stars appear to rise and set from east to west, but really the sky is not moving and Earth is rotating from (north, south, east, west) to (north, south, east, west)
What will be an ideal response?
If a 20-kg object dropped in air has a terminal speed of 60 m/s, what was its acceleration at 30 m/s?
a. 9.80 m/s2 b. 7.35 m/s2 c. 4.90 m/s2 d. 2.45 m/s2 e. More information is needed to answer this question.
The mass of an electron and its antiparticle, a positron, is 0.511 MeV/c2 . In order to produce an electron-positron pair, a gamma ray must have an energy larger than 1.022 MeV because __________
Fill in the blank(s) with correct word