Helium-neon laser light (l = 6.33 × 10^-7 m) is sent through a 0.30 mm-wide single slit. What is the width of the central maximum on a screen 1.0 m from the slit?
a. 2.0 cm
b. 4.2 mm
c. 1.1 cm
d. 2.0 mm
e. 0.70 mm
B
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Choose the correct word(s) that make the statement true. A (lunar, solar) eclipse occurs when the Moon is (new, quarter, gibbous, full) and the ordering of aligned celestial objects is always Sun, Earth, Moon
What will be an ideal response?
We have obtained spectra of two hydrogen gas clouds and are studying an emission line that has a laboratory wavelength of 656.3 nm. This emission line appears in Cloud A's spectrum with a wavelength of 660.1 nm and in Cloud B's spectrum at 670.2 nm. What can we conclude about these clouds?
A) They are both moving toward us, and Cloud A is moving faster than Cloud B. B) They are both moving away from us, and Cloud A is moving faster than Cloud B. C) They are both moving away from us, and Cloud B is moving faster than Cloud A. D) They are both moving toward us, and Cloud B is moving faster than Cloud A.
Radiometric dating of a rock reveals an age of 1.52 billion years. Given that the half-life of the parent isotope used is 14.0 billion years, what percentage of the parent isotope is still present in the rock?
A) 92.8% B) 10.9% C) 76.4% D) 7.26%
An incredibly dense star so massive that light cannot escape from its surface is called a(n) ______________
Fill in the blank(s) with correct word