An ionized gas is a state of matter called a __________
Fill in the blank(s) with correct word
plasma
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The luminosity of the white dwarf supernova 175 days after it reaches peak brightness is about ________ of its luminosity at peak brightness.
A) 30% B) 10% C) 3% D) 1%
When the reflection of an object is seen in a plane mirror, the image is:
a. real and upright. c. real and inverted. b. virtual and upright. d. virtual and inverted.
In general, sound travels faster through:
a) solids than through gases b) gases than through solids c) gases than through liquids d) empty space than through matter
In an electric furnace used for refining steel, the temperature is monitored by measuring the radiant power emitted through a small hole of area 0.50 cm2. The furnace acts like a blackbody radiator
If it is to be maintained at a temperature of 1650°C, at what level should the power radiated through the hole be maintained?