If the interplanar spacing of NaCl is 2.814 × 10^-10 m, what is the predicted angle at which X-rays of wavelength 0.140 nm will be diffracted in a first-order maximum?
a. 31.3°
b. 7.20°
c. 20.5°
d. 14.4°
e. 29.8°
D
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When you turn on a lamp, the initial current in its filament is greater at first, rather than a moment later, which indicates
A) something is faulty. B) a time delay for current attaining its average speed. C) increased temperature means increased resistance. D) nothing of interest
Special relativity predicts that light bends near dense objects
Indicate whether the statement is true or false
The seven days of the week are related to the
A) Sun, Moon and five naked eye planets B) seven brightest stars in the sky C) seven planets known at the end of the 19th century D) seven most prominent constellations that the Sun, Moon and planets pass through
Consider the planet Mars: [Earth mass = 6.0 × 1024 kg = 9.3 × Mars mass; Earth radius = 6380.km = 1.89 × Mars radius] What is the acceleration of gravity on Mars?
What will be an ideal response?