How is a constellation different from an asterism?
What will be an ideal response?
A constellation is a group of stars in the sky with defined boundaries, recognized by the International Astronomical Union (IAU), and an asterism is a named group of stars that is not recognized by the IAU. Stars that form asterism can be a part of one or several constellations.
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Strictly speaking, the ratio of circumference to diameter for a circle equals ? as we know it
A) in flat space. B) on a spherical surface. C) on a saddle-shaped surface. D) all or any of the above E) none of the above
What is the slit spacing of a diffraction necessary for a 600 nm light to have a first order principal maximum at 25.0°?
A) 1.42 ?m B) 2.01 ?m C) 3.12 ?m D) 4.12 ?m E) 5.44 ?m
A laser pulse of duration 25 ms has a total energy of 1.4 J. If the wavelength of this radiation is 567 nm, how many photons are emitted in one pulse? (c = 3.00 × 108 m/s, h = 6.626 × 10-34 J ? s)
A) 4.8 × 1019 B) 3.2 × 1017 C) 9.9 × 1019 D) 4.0 × 1018 E) 1.6 × 1017
The energy differences in some of the rotational energy levels of the water molecule allow
a. X-rays to be produced. b. cooking with microwaves. c. visible spectral lines to be formed. d. lasers to operate.