What are the three main parts of our Galaxy?
What will be an ideal response?
The disk, bulge, and halo.
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Calculate
(a) Calculate the distance required to reduce a beam of photons of energy 1.0 eV that have entered germanium to 50 percent of the initial intensity. (b) What is the wavelength of photons of energy 1.0 eV? (c) Photons of 1.0 eV correspond to what type of electromagnetic radiation? (d) Comment on using germanium for the lenses of an optical system to operate with 1.0 eV photons.
Find the circulation for the path shown.
A. -(4 A)
B. (4 A)
C. -(28 A)
D. (28 A)
E. -(7 A)
If a = 3.0 mm, b = 4.0 mm, Q1 = ?60 nC, Q2 = 80 nC, and q = 30 nC in the figure, what is the magnitude of the electric force on q?
a.
1.4 N
b.
1.0 N
c.
1.7 N
d.
2.0 N
e.
0.50 N
A camera lens has a focal length of 50.0 mm and an aperture setting of f/4.00. What is the aperture diameter of this lens?
A) 14.2 mm B) 13.6 mm C) 10.1 mm D) 12.5 mm E) 15.0 mm