1998 Physics Olympiad Screening Test (21-30)
and class period (1-8)
B. 6.56 nm
C. 65.6 nm
D. 656 nm
E. 6560 nm
A. 1.5 cm
B. 1.8 cm
C. 2.3 cm
D. 3.0 cm
E. 4.5 cm
23. A thin film of thickness t and index of refraction 1.33
coats a glass with index of refraction 1.50 as shown to the right. Which
of the following thicknesses t will not reflect light with wavelength 640 nm in air? Hint:
Light undergoes a 180º phase shift when it is reflected off a
material with a higher index of refraction.
A. 160 nm
B. 240 nm
C. 360 nm
D. 480 nm
E. 640 nm
A. 6 cm in front of the mirror and real.
B. 6 cm behind the mirror and virtual.
C. 12 cm in front of the mirror and virtual.
D. 24 cm in front of the mirror and virtual.
E. 24 cm behind the mirror and virtual.
Which of the following statements
I. The force on the
proton is greater than the force on the electron.
II. The potential energy of the proton is greater than that of the electron.
III. The potential energy of the proton and the electron is the same.
A. I only
B. II only
C. III only
D. I & II only
E. I & III only
A. 51 V
B. 42 V
C. 36 V
D. 24 V
E. 21 V
A. 4 R
B. 2 R
D. (1/2) R
E. (1/4) R