A light beam having a wavelength of 470. nm in air is directed into glycerine (n = 1.47)
(a) What is the frequency of the light in the glycerine?
(b) What is its wavelength in the glycerine?
(c) If the incident angle is 75.0°, what is the refracted angle?
(a) 6.38 × 1014 Hz
(b) 320. nm
(c) 41.1°
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Velocity: Arthur and Betty start walking toward each other when they are 100 m apart. Arthur has a speed of 3.0 m/s and Betty has a speed of 2.0 m/s. How long does it take for them to meet?
Fill in the blank(s) with the appropriate word(s).
The net force exerted on a car traveling in a circular path at constant speed is
A) directed forward, in the direction of travel. B) directed toward the center of the curve. C) zero because the car is not accelerating. D) none of the above
Compared with the standard hour of 60 minutes used today, the hour of ancient Egypt
A) was longer than the hour used today. B) was shorter than the hour used today. C) differed in length depending on the pharaoh in power at the time. D) was longer than 60 minutes in the summer and shorter than 60 minutes in the winter. E) divided the entire day into 12 equal parts.
According to Einstein, increasing the brightness of a beam of light without changing its color will increase:
a. the number of photons. b. the energy of each photon. c. the speed of the photons. d. the frequency of the photons.