A changing magnetic field produces an electric field
Indicate whether the statement is true or false
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Calculate the de Broglie wavelength for an electron (m = 1 × 10^-30 kg) moving at 2.4 × 10^6 m/s
A student attaches a length of nylon fishing line to a fence post. She stretches it out and shakes the end of the rope in her hand back and forth to produce waves on the line. The most efficient way for her to increase the wavelength is to
a. increase the tension on the hose and shake the end more times per second. b. decrease the tension on the hose and shake the end more times per second. c. increase the tension on the hose and shake the end fewer times per second. d. decrease the tension on the hose and shake the end fewer times per second. e. keep the tension and frequency the same but increase the length of the hose.
A charged particle (m = 5.0 g, q = ?70 ?C) moves horizontally at a constant speed of 30 km/s in a region where the free fall gravitational acceleration is 9.8 m/s2 downward, the electric field is 700 N/C upward, and the magnetic field is perpendicular to the velocity of the particle. What is the magnitude of the magnetic field in this region?
a. 47 mT b. zero c. 23 mT d. 35 mT e. 12 mT
As a result of the atmosphere surrounding the Earth trapping some of the incoming solar radiation, the average temperature of the Earth is approximately 15°C. Estimate the amount of radiation that is trapped by the atmosphere, including CO2 and methane, which provides the shield to maintain the temperature at a level that sustains living organisms. Comment on the current concern about global warming as a result of an increasing percentage of CO2 and methane in the atmosphere surrounding the Earth.
GIVEN The average temperature of the earth is 150C. FIND • Amount of radiation trapped by atmosphere • Comment on concern about global warming as a result of increasing percentage of CO2