Why would a hotter star appear blue-white while a cooler star appear red or not be visible at all?
What will be an ideal response?
The hotter the star the shorter the wavelength it peaks at. A star that emits light across the entire visible spectrum would appear white. One that peaked beyond the visible would appear blue-white. A cooler star may peak in the red part of the spectrum, or even in the infrared.
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Denver, Colorado and Istanbul, Turkey have similar latitudes but very different longitudes. Which of the following is true about how observers in those cities will view the constellation Orion, which is located approximately on the celestial equator?
A) Orion will cross the meridian at about the same local time in both cities, but at different altitude and direction. B) Orion will cross the meridian at the same altitude and direction in both cities, but at different local times. C) Orion will cross the meridian at the same altitude and direction and at about the same local time in both cities. D) If Orion is visible in the night sky in one city, then the other city will need to wait a few months to see Orion in its night sky.
The internal energy of a system such as helium gas can be identified as the total mechanical energy of the ________.
What will be an ideal response?
Identify the FALSE statement. The big bang:
occurred more than 13 billion years ago. cataclysmically exploded matter outward. began with all matter and energy concentrated in an infinitesimally small point. theory states that at the instant of explosion, everything had so much thermal energy even the smallest atomic pieces couldn't exist. is the explanation for how our Solar System developed.
A circular loop of wire with a radius of 4.0 cm is in a uniform magnetic field of magnitude 0.060 T. The plane of the loop is perpendicular to the direction of the magnetic field. In a time interval of 0.50 s, the magnetic field changes to the opposite direction with a magnitude of 0.040 T. What is the magnitude of the average emf induced in the loop?
1.0.20 V 2.0.025 V 3.5.0 mV 4.1.0 mV 5.20 mV