Halving the focal length of a telephoto lens, while holding aperture size constant, will change the light intensity admitted to the film by what factor?
a. 0.50
c. 0.25
b. 2.0
d. 4.0
D
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The figure shows two forces, each of magnitude 4.6 N, acting on an object
The angle between these forces is 40°, and they make equal angles above and below the horizontal. What third force will cause the object to be in equilibrium (acceleration equals zero)? A) 8.6 N pointing to the right B) 7.0 N pointing to the right C) 4.3 N pointing to the right D) 3.5 N pointing to the right
Answer the following statement(s) true (T) or false (F)
To create an interference pattern, a quanton beam’s de Broglie wavelength must be larger than an individual quanton.
A sample of gas has its number of molecules halved, its Kelvin temperature doubled, and its volume halved. What is the new pressure, relative to the original pressure?
Acrux has an MV = –4.2 and an mV = 0.81 . Therefore, Acrux is actually brighter than we perceive it to be
a. True b. False Indicate whether the statement is true or false