A sound wave in air has a frequency of 515 Hz and a wavelength of 0.68 m. What is the air temperature?

a. –18°C
c. 15°C
b. 32°C
d. 27°C


B

Physics & Space Science

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An annular solar eclipse occurs every year.

Answer the following statement true (T) or false (F)

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What is the f-number of a camera lens that has an aperture-opening diameter of 0.20 cm and a focal length of 3.0 cm?

a. 10 c. 15 b. 0.10 d. 0.80

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The radius of planet Relpek is identical to that of Earth, yet the mass is twice that of Earth’s. Your weight on Relpek, compared to your weight on Earth, is

A. quartered. B. halved. C. the same. D. doubled. E. quadrupled.

Physics & Space Science

The black fur of a black-and-white bunny is due to light

A) absorption. B) reflection. C) refraction. D) scattering.

Physics & Space Science