The Dirac theory predicted that a positron would be:
a. a particle with same mass as an electron but with opposite charge.
b. a particle with negative mass.
c. a negative electron in a negative energy state.
d. All of the above.
A
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Snell's Law: A light beam having a wavelength of 470 nm in air is directed into glycerine at an angle of 75.0° with the normal in air. Glycerine has a refractive index of 1.47. (c = 3.0 × 108 m/s)(a) What are the frequency and wavelength of the light in the glycerine?(b) What angle does the light beam make with the normal in the glycerine?
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Today we rely largely on what technique to precisely measure distances in the solar system?
A) Transits of Venus across the Sun B) Radar echo timings C) Measurement of stellar parallaxes. D) Timings of the eclipses of its moons by Jupiter's shadow E) Precise measurements of length of the year with atomic clocks
The opacity of a gas depends strongly on its _____
A) mass B) density C) volume D) temperature
Kirchhoff was the first to describe qualitatively the types of spectra we observe from luminous objects. Describe the three types and their sources
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