A 1 cm diameter thick shield is placed around a furnace. What diameter holes should be put in the shield so that 50% of the incident radiation on the hole passes through?
What will be an ideal response?
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An electron has a velocity of 6.0 × 106 m/s in the positive x direction at a point where the magnetic field has the components Bx = 3.0 T, By = 1.5 T, and Bz = 2.0 T. What is the magnitude of the acceleration of the electron at this point?
A. 2.1 × 1018 m/s2 B. 1.6 × 1018 m/s2 C. 2.6 × 1018 m/s2 D. 3.2 × 1018 m/s2 E. 3.7 × 1018 m/s2
A ruby laser delivers a 2.28-J pulse in approximately 50 nanoseconds. The wavelength of the light is 694.4 nm. At least how many atoms within the ruby rod had to be excited to allow this high-energy laser pulse? (h = 6.63 × 10^-34 J×s, c = 3.00 × 10^8 m/s, 1 eV = 1.6 × 10^-19 J, and 1 nm = 10-9 m)
a. 3 × 10^19 c. 8 × 10^18 b. 4 × 10^18 d. 6 × 10^20
The central engine of an active galaxy is less than a parsec in diameter
Indicate whether the statement is true or false
What is the minimum thickness of a glycerin film (n = 1.47) on which light of wavelength 684 nm shines that results in constructive interference of the reflected light? Assume the film is surrounded front and back by air
a. 233 nm b. 116 nm c. 251 nm d. 503 nm e. 126 nm