Far-infrared astronomy must be done from high-flying aircraft because:
A) far-infrared radiation never reaches Earth's surface.
B) far-infrared photons are highly energetic.
C) far-infrared telescopes have zero diffraction fringe.
D) far-infrared sources are very bright.
A
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When a glass rod is rubbed with silk, which of the following statements best describes what happens?
a. Electrons are removed from the rod. c. The silk remains neutral. b. Protons are removed from the silk. d. The silk is charged positively.
Which of the following sequences of electromagnetic radiation is arranged in the order of increasing energy?
A) Gamma rays, X-rays, infrared radiation, and radio waves B) Radio waves, microwaves, gamma rays, and ultraviolet radiation C) Visible light, ultraviolet radiation, X-rays, and gamma rays D) Visible light, microwaves, radio waves, and infrared radiation
The objective lens of a telescope has a focal length of 1.90 m. When viewed through this telescope, the Moon appears 5.25 times larger than normal
How far apart are the objective lens and the eyepiece when this instrument is focused on the Moon?
A car approaches you at a constant speed, sounding its horn, and you hear a frequency of 76 Hz
After the car goes by, you hear a frequency of 65 Hz. What is the frequency of the sound emitted by the horn? The speed of sound in the air is 343 m/s. A) 68 Hz B) 69 Hz C) 70 Hz D) 71 Hz E) 72 Hz