A rainbow shows separate colors of the spectrum because, at raindrop surfaces,
A. blue light is bent more than red light.
B. all colors are bent the same, hence the separation.
C. green light is bent more than blue light.
D. red light is bent more than green light.
Answer: A
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The presence of a magnetic field is a good indication that:
A) the Earth's interior is similar to Mercury's, as both have fields. B) a huge iron meteorite lies somewhere high up in the mantle, not in the core. C) we have a liquid metal outer core, spinning rapidly as we rotate. D) the Earth's interior must be completely molten to the center. E) the Earth's interior has had time to solidify, with a rigid bar magnet created.
How does the gravity of an object affect light?
A) Light doesn't have mass; therefore, it is not affected by gravity. B) Light coming from a compact massive object, such as a neutron star, will be redshifted. C) Light coming from a compact massive object, such as a neutron star, will be blueshifted. D) Visible light coming from a compact massive object, such as a neutron star, will be redshifted, but higher frequencies such as X-rays and gamma rays will not be affected. E) Less energetic light will not be able to escape from a compact massive object, such as a neutron star, but more energetic light will be able to.
You walk barefoot in your house and cross from the carpeted living room to the tiled-floor kitchen. The tile floor always feels
A) cooler than the carpet. B) the same temperature as the carpet. C) warmer than the carpet. D) warmer than the carpet in summer but cooler in winter. E) cooler than the carpet in summer but warmer in winter.
During the volcanic eruption of Mt. Pelee in 1902, an incredibly hot "burning cloud" rolled down the mountain and incinerated the town of Saint-Pierre. From the damage done, the temperature in the cloud was estimated at 700°C. If the air temperature
was 20°C and a mole of air is 29 grams, estimate the molecular weight of the gas in the "burning cloud" that made it heavier than the surrounding air. (As a follow-on, estimate the most probable composition of the cloud. Some typical volcanic gases are H2S, SO2, H2SO4, CO2, NO.)