A diffraction grating with 10 rulings is illuminated by a light source. When do other wavelengths begin to distinguish themselves from 500 nm in the second order?
1.at 475 nm and 525 nm
2.at 450 nm and 550 nm
3.at 495 nm and 505 nm
4.at 487.5 nm and 512.5 nm
1
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A 2.15 kg lightly damped harmonic oscillator has an angular oscillation frequency of 0.261 rad/s
If the maximum displacement of 2.0 m occurs when t = 0.00 s, and the damping constant b is 0.74 kg/s what is the object's displacement when t = 4.01 s? A) 0.50 m B) 0.43 m C) 0.58 m D) 0.65 m
What is the dynamo model of Earth's magnetic field?
A. Earth's magnetic field changes too rapidly for it to be generated in Earth's interior. B. Earth's magnetic field is maintained by convection in the interior of the planet, as well as its rotation. C. Electric currents in the atmosphere (aurora) generate Earth's magnetic field. D. Currents in Earth's oceans maintain the planet's magnetic field. E. None of these choices are correct.
What are the important relics of the lepton epoch? Why are they important?
What will be an ideal response?
Astigmatism is usually due to
A) the cornea or lens being out of round. B) accommodation. C) myopia. D) missing rods. E) hyperopia.