An elephant can hear sound with a frequency of 15 Hz. What is the wavelength of this wave if the speed of sound in air is 343 m/s?
What will be an ideal response?
23 m
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What will be an ideal response?
Collisions between low density continental plates create the tallest mountain chains, such as the Himalayas
Indicate whether the statement is true or false
A perfectly black body at 100°C emits light of intensity I that has the strongest intensity near wavelength ?. The temperature of this body is now increased to 200°C
(a) In terms of I, what is the intensity at which this hotter body radiates? (b) In terms of ?, near what wavelength does light radiated from this hotter body have the strongest intensity?
From an observational standpoint, what is a pulsar?
A) an object that emits flashes of light several times per second (or even faster), with near perfect regularity B) a star that slowly changes its brightness, getting dimmer and then brighter, with a period of anywhere from a few hours to a few weeks C) an object that emits random "pulses" of light, sometimes with only a fraction of a second between pulses and other times with several days between pulses D) a star that changes color rapidly, from blue to red and back again