A laser beam passes through a thin slit. When the pattern is viewed on a screen 1.25 m past the slit, you observe that the fifth-order dark fringes occur at ±2.41 cm from the central bright fringe
The entire experiment is now performed within a liquid, and you observe that each of the fifth-order dark fringes is 0.790 cm closer to the central fringe than it was in air. What is the index of refraction of this liquid? A) 1.33
B) 1.40
C) 1.49
D) 1.62
E) 3.05
C
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What is interstellar reddening?
A) Interstellar dust absorbs more red light than blue light, making stars appear redder than their true color. B) Interstellar dust absorbs more red light than blue light, making stars appear bluer than their true color. C) Interstellar dust absorbs more blue light than red light, making stars appear redder than their true color. D) Interstellar dust absorbs more blue light than red light, making stars appear bluer than their true color. E) The spectral line shift due to a star's motion through the interstellar medium.
A 2.0-kg block slides on a frictionless 25° inclined plane. A force of 4.6 N acting parallel to the incline and up the incline is applied to the block. What is the acceleration of the block?
a. 1.8 m/s2 up the incline b. 2.3 m/s2 up the incline c. 6.6 m/s2 down the incline d. 1.8 m/s2 down the incline e. 2.3 m/s2 down the incline
A 0.50-kg mass attached to the end of a string swings in a vertical circle (radius = 2.0 m). When the string is horizontal, the speed of the mass is 8.0 m/s. What is the magnitude of the force of the string on the mass at this position?
a. 16 N b. 17 N c. 21 N d. 11 N e. 25 N
Photon Energy: What is the energy (in eV) of an optical photon of frequency 6.43 × 1014 Hz. (h = 6.626 × 10-34 J ? s, 1 eV = 1.60 × 10-19 J)
A. 2.66 eV B. 1.62 eV C. 1.94 eV D. 3.27 eV