The constellations were created by the Greeks
Indicate whether the statement is true or false
F
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The visible light portion of the electromagnetic spectrum has wavelengths ranging from about 400 to 700 nanometers (nm). Which of the following statements is true?
A) Blue light has wavelength of about 400 nm, red light has wavelength of about 700 nm. B) Blue light has wavelength of about 700 nm, red light has wavelength of about 400 nm. C) Blue light and red light can both have wavelengths that may be anywhere between 400 and 700 nm. D) Blue light and red light both have wavelengths of about 550 nm.
The frictional force, due to air resistance, acting on an object is always
A. in the direction of the object's motion. B. in the upward direction. C. greater than the net force. D. smaller than object's weight. E. in the opposite direction to the object's motion.
An airplane with a wingspan of 60.0 m flies parallel to the Earth's surface at a point where the downward component of the Earth's magnetic field is 0.400 × l0-4 T. If the induced potential between wingtips is 0.600 V, what is the plane's speed?
a. 338 m/s c. 250 m/s b. 375 m/s d. 417 m/s
One experimental observation that demonstrates Einstein's ideas on the relativity of time, is
A) electromagnetic waves from the early stages of the development of the universe have slower rates of vibration. B) muons "live" longer when moving rapidly than they do when they are at rest. C) a laser beam emitted from an orbiting satellite is observed from Earth. D) rapidly-rotating neutron stars spin more slowly than they would if they weren't moving rapidly away from us. E) the recent discovery of very fast-moving particles known as tachyons.