A student wants to establish a standing wave on a wire 1.8 m long clamped at both ends. The wave speed is 540 m/s. What is the minimum frequency she should apply to set up standing waves?
150 Hz
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A piezoelectric actuator is being produced for a scanning tunneling microscope. The piezoelectric actuator is to be 1×10-3 m in length and produced from barium titanate, which has a dielectric breakdown strength of 6×106 V/m. The piezoelectric strain coefficient of the barium titanate is 1.9×10-10 m/V. Assume that the maximum electric field that can be applied to the piezoelectric material is 1×106 V/m.
(a) What is the required voltage to produce an atomic-scale displacement of 0.1 nm? (b) What is the displacement produced by 1000 V? (c) With 1000 V applied, is the piezoelectric safe from dielectric breakdown?
The bluer the light, the ____ each photon contains
a. more energy b. less energy c. less speed d. more speed e. none of the above
What are the clouds of Venus mainly composed of?
A. carbon dioxide B. sulfuric acid droplets C. methane D. water vapor
The gravitational field is equivalent to:
a. the inertial mass. c. a clock running slowly. b. an event horizon. d. an accelerated frame of reference.