MCQ

Physics 295 Chapter 38 Multiple Choice Problems
Multiple Choice
Identify the choice that best completes the statement or answers the question.
____ 1. Helium-neon laser light (? = 6.33 ? 10?7 m) is sent through a 0.30 mm-wide single slit. What is the width of
the central maximum on a screen 1.0 m from the slit?
a. 2.0 cm
b. 4.2 mm
c. 1.1 cm
d. 2.0 mm
e. 0.70 mm
____ 2. A narrow slit is illuminated with sodium yellow light of wavelength 589 nm. If the central maximum extends
to ?30?, how wide is the slit?
a. 0.50 mm
b. 2.2 ? 10?6 m
c. 3.3 ? 10?5 m
d. 1.18 ?m
e. 5.89 ?m
____ 3. Plane waves of ultrasound, f = 51.0 kHz, impinge on a flat plane with a 1.00 cm-wide slit. What is the total
angular width (2?) of diffracted sound waves when the speed of sound in air is 340 m/sec.
a. 167?
b. 83.6?
c. 19.5?
d. 41.8?
e. 0.11?
____ 4. Monochromatic light from a He-Ne laser (? = 632.8 nm) is incident on a diffraction grating containing 5000
lines/cm. Determine the angle of the first-order maximum.
a. 18.4?
b. 39.2?
c. 14.6?
d. 27.7?
e. 13.9?
____ 5. A helium-neon laser (? = 632.8 nm) is used to calibrate a diffraction grating. If the first-order maximum
occurs at 20.5?, what is the line spacing, d?
a. 1.81 ? 10?6 m
b. 1.00 ? 10?5 m
c. 1.00 ? 10?4 m
d. 1.31 ? 10?6 m
e. 6.76 ? 10?7 m