A single thin slit forms a diffraction pattern, with the first minimum at an angle of 40.0° from central maximum
If monochromatic light of 530.0-nm wavelength is used for the illumination, what is the width of the slit?
A) 825 nm
B) 791 nm
C) 757 nm
D) 723 nm
E) 689 nm
A
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What of the following distance methods is used to determine the distance to the most distant galaxies?
a. radar echo b. supernova observations c. period-luminosity relationship of variable stars d. parallax
According to the principle of complementarity, wavelike and particle-like properties of light
A) only slightly contradict each other. B) very much contradict each other. C) make up a wholeness that better describes nature. D) none of the above
Suppose a solid uniform sphere of mass M and radius R rolls without slipping down an inclined plane starting from rest. The angular velocity of the sphere at the bottom of the incline depends on
A) the mass of the sphere. B) the radius of the sphere. C) both the mass and the radius of the sphere. D) neither the mass nor the radius of the sphere.
Carbon-14 has a half-life of 5730 y. A sample of wood has been recovered by an archaeologist. The sample is sent to a laboratory,
where it is determined that the activity of the sample is 0.144 Bq/g. By comparing this activity with the activity of living organic matter, 0.230 Bq/g, the scientist determines how old the wood sample is, or more precisely, when the tree that the sample came from died. How old is the sample of wood? A) 2940 y B) 3870 y C) 2630 y D) 4250 y E) 4590 y