State Huygen's principle
What will be an ideal response?
Every point on a wave front can be considered as a source of tiny wavelets that spread out in the forward direction at the speed of the wave itself. The new wave front is the envelope of all the wavelets - that is, tangent to all of them.
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Which of the following is not a piece of evidence supporting the idea that Pluto is a large comet of the Kuiper belt?
A) Pluto's composition appears to match that of other known Kuiper belt comets. B) Triton, which must once have orbited the Sun before being captured by Neptune, is significantly larger than Pluto. C) Pluto grows a coma and a long tail when it is at the point in its orbit closest to the Sun. D) Pluto's orbit is very similar to the orbits of other known Kuiper belt comets. E) Pluto is not the largest object orbiting in the region of the Kuiper belt.
If you connect two identical storage batteries together in parallel, and place them in a circuit, the combination will provide
A) twice the voltage and twice the total charge that one battery would. B) twice the voltage and the same total charge that one battery would. C) the same voltage and twice the total charge that one battery would. D) half the voltage and half the total charge that one battery would. E) half the voltage and twice the total charge that one battery would.
A diffraction grating is to be used to find the wavelength of the light in the emission spectrum of a gas. The grating spacing is not known,
but a light having a known wavelength of 632.8 nm is deflected by 43.2° away from the central maximum in the second order by this grating. Light of the wavelength to be measured is deflected by 48.2° away from the central maximum in the second order. What is the wavelength of this light?
A beam of polarized light of intensity I0 passes through a sheet of ideal polarizing material. The polarization axis of the beam and the transmission axis of the sheet differ by 45°. What is the intensity of the emerging light?
a. 0.25I0 c. 0.50I0 b. 0.87I0 d. 0.75I0