Thin Films: An oil film with refractive index 1.48 and thickness 290 nm is floating on water and illuminated with white light at normal incidence. What is the wavelength of the dominant color in the reflected light?
A. green (541 nm)
B. blue-green (493 nm)
C. violet (404 nm)
D. yellow (572 nm)
E. blue (470 nm)
Answer: D
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A ball is thrown horizontally from the top of a building 0.10 km high. The ball strikes the ground at a point 65 m horizontally away from and below the point of release. What is the speed of the ball just before it strikes the ground?
A. 43 m/s B. 47 m/s C. 39 m/s D. 36 m/s E. 14 m/s
The figure shows a ‘snapshot’ of four different waves in identical ropes stretched with the same force
The wave where the speed is greatest is
a.
I.
b.
II.
c.
III.
d.
IV.
e.
all of the above.
The magnetic field inside a circular loop of wire of radius 30 cm increases at a constant rate from 2.0 × 10^–3 T to 3.5 × 10^–3 T in 0.47 s. What is the induced emf in the wire?
a. 9.0 ×10–4 V b. 2.3 ×10–4 V c. 1.8 ×10–3 V d. 1.8 ×10–4 V
All the following statements are true. Which one can be attributed to the exclusion principle?
A) Two electrons with the same spin cannot occupy the same energy level in an atom. B) If we know the location of an electron quite well, we will have little idea where it is going next. C) If an electron and antielectron meet, they will turn into energy through mutual annihilation. D) An electron has energy equal to its mass times the speed of light squared.