Photography Optics: A slide projector needs to focus the image of a 24.0-mm × 36.0-mm slide onto a square screen 1.50 m on each side. You want to fill the screen as completely as possible without any of the image falling beyond the screen. Due to space constraints in the projector, the slide must be placed 10.5 cm from the lens.(a) What magnification does the projector produce?(b) How far from the lens should the screen be placed?(c) What focal length projector lens is needed?
What will be an ideal response?
(a) 41.7, (b) 4.38 m, (c) 10.3 cm
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Photon Energy: What is the wavelength of a photon having energy 2.00 eV? (c = 3.00 × 108 m/s, h = 6.626 × 10-34 J ? s, 1 eV = 1.60 × 10-19 J)
Fill in the blank(s) with the appropriate word(s).
According to Wien's law, the dominant wavelength in the continuous emission spectrum of a red apple is 700 nm. (Hint: use Wien's law.)
Answer the following statement true (T) or false (F)
The force required to maintain a constant velocity for an astronaut in free space is equal to
A) zero. B) the mass of the astronaut. C) the weight of the astronaut. D) the force required to stop the astronaut. E) none of the above
Between us and the Galactic Center, the Milky Way has a mass of:
A) several hundred thousand suns. B) one to two million suns. C) 250 million suns. D) 100 billion suns. E) over a trillion suns.