When a light wave enters into a medium of different optical density,
A)
only its speed changes.
B)
its speed and frequency change.
C)
its speed and wavelength change.
D)
its frequency and wavelength change.
E)
its speed, frequency, and wavelength change.
C
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Proportional Reasoning: Two identical objects A and B fall from rest from different heights to the ground. If object B takes twice as long as object A to reach the ground, what is the ratio of the heights from which A and B fell? Neglect air resistance.
A. hA/hB = 1/
B. hA/hB = 1/2
C. hA/hB = 1/4
D. hA/hB = 1/8
A 7.0-kg rock is subject to a variable force given by the equation
F(x) = 6.0 N - (2.0 N/m)x + (6.0 N/m2)x2 If the rock initially is at rest at the origin, find its speed when it has moved 9.0 m. What will be an ideal response?
Which occurrence is associated with the demise of the dinosaurs?
a. The Great Dying b. The Cambrian explosion c. The breakup of Pangaea d. The K-T event
A small town has decided to forego the use of electrical power and send energy through town via mechanical waves on ropes
They use rope with a mass per length of 1.50 kg/m under 6000 N tension. If they are limited to a wave amplitude of 0.500 m, what must be the frequency of waves necessary to transmit power at the average rate of 2.00 kW? A) 24.8 Hz B) 169 Hz C) 60.0 Hz D) 2.07 Hz E) 2.00 kHz