Two uses of ultrasound are navigation by bats and controlling insects
a. True
b. False
Indicate whether the statement is true or false
True
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Our Sun is a star of spectral type
A) G. B) F. C) S. D) M.
Carol is stationary midway between two light bulbs and observes that they turn on at the exact same time. You are moving near the speed of light toward the light bulb to Carol's left. What do you observe?
A) You observe the light bulb to the left turns on first. B) You observe the light bulb to the right turns on first. C) You observe the light bulbs turn on at the same time, like Carol. D) The order of the events depends on how fast you are moving.
Suppose you photographed Earth's dark side from space, using ultraviolet-sensitive film, and using infrared-sensitive film. What would you expect to see in the photo?
A) Both photos would show radiation coming from all over Earth. B) The ultraviolet photo would show only artificial sources such as streetlights, while the infrared photo would show radiation coming from all over Earth. C) Neither photo would show anything--they would both be completely dark. D) Both photos would show only artificial sources, such as streetlights. E) The ultraviolet photo would show radiation coming from all over Earth, while the infrared photo would show only artificial sources such as streetlights.
As a treatment for cataracts (a cloudiness of the lens of the eye), the natural lens is removed and a plastic lens is implanted. After this is done a person can see distant objects clearly, but he cannot accommodate to focus on nearby objects
If such a person wanted to read a book at a distance of 25 cm, he would have to wear contact lenses having a diopter power of A) +2.78 diopters. B) +3.33 diopters. C) -1.78 diopters. D) +4.00 diopters. E) -4.00 diopters.