Why does a neon light appear red?
a) It produces ultraviolet light, which to our eyes appears red.
b) The atoms of neon have electrons that are primarily red.
c) It gives off an emission spectrum with mostly red spectral lines.
d) The metal filament inside is heated to 1000 Kelvin.
e) The gas in the bulb absorbers every other color besides red.
Ans: c) It gives off an emission spectrum with mostly red spectral lines.
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A rocket of total mass M and with burnout mass 0.20M attains a speed of 3 400 m/s after starting from rest in deep space. What is the exhaust velocity of the rocket?
a. 6.8E+2 m/s b. 2.1E+3 m/s c. 1.7E+4 m/s d. 2.2E+3 m/s e. 1.1E+3 m/s
The age of the whole Galaxy has been found from studies of its oldest stars in the ________ clusters that orbit in the Halo
Fill in the blank(s) with correct word
A single slit is illuminated at normal incidence with a parallel beam of light having a wavelength of The entire central band of the diffraction pattern is observed at ±90°
The illumination is now replaced by a nonrelativistic beam of electrons, each having a kinetic energy of 980 eV. When this beam hits the slit at normal incidence, at what angle will the first minimum of the electron diffraction pattern occur? (h = 6.626 × 10-34 J ? s, mel = 9.11 × 10-31 kg, 1 eV = 1.60 × 10-19 J) A) 0.095 mrad B) 0.071 mrad C) 0.046 mrad D) 0.12 mrad E) 0.14 mrad
In a thermoplastic elastomer there are areas of _________bonding that allow for large strains, and areas of strong bonding that anchor the LCMs together.
Fill in the blank(s) with the appropriate word(s).