An object that is negatively charged will
a. repel a rubber rod stroked with fur.
b. repel a glass rod stroked with silk.
c. be polarized.
d. none of these
[Ques. 2] In a double slit experiment, the distance between the slits is 0.2 mm and the distance to the screen is 150 cm. What is the phase difference (in degrees) between the waves from the two slits arriving at a point P when the angular distance of P is 10 relative to the central peak, and the wavelength is 500 nm? (Convert your result so the angle is between 0 and 360.)
a. 145
b. 155
c. 165
d. 135
e. 95
[Ques. 3] Which of the following is usually burned up in Earth's atmosphere?
a. Asteroid
b. Meteoroid
c. Meteor
d. Meteorite
[Ques. 4] An object that is positively charged will
a. attract a rubber rod stroked with fur.
b. attract a glass rod stroked with silk.
c. be polarized.
d. none of these
[Ques. 5] In a double-slit experiment, the distance between the slits is 0.2 mm, and the distance to the screen is 150 cm. What wavelength (in nm) is needed to have the intensity at a point 1 mm from the central maximum on the screen be 80 of the maximum intensity?
a. 900
b. 700
c. 500
d. 300
e. 600
[Ques. 6] Which of the following is believed to have caused the extinction of the dinosaurs on Earth?
a. An asteroid
b. A meteoroid
c. A comet
d. Interplanetary dust
[Ques. 7] An object that is negatively charged will
a. attract a rubber rod stroked with fur.
b. attract a glass rod stroked with silk.
c. be polarized.
d. none of these
[Ques. 8] Two slits are illuminated with red light ( = 650 nm). The slits are 0.25 mm apart and the distance to the screen is 1.25 m. What fraction of the maximum intensity on the screen is the intensity measured at a distance 3.0 mm from the central maximum?
a. 0.94
b. 0.92
c. 0.96
d. 0.98
e. 0.99
[Ques. 9] Which of the following is(are) believed to be material that never collected into a single planet?
a. Asteroids
b. Meteoroids
c. Comets
d. Interplanetary dust
[Ques. 10] A system of a proton and an electron has a net charge of
a. +1.6 10-19 C.
b. 1.6 10-19 C.
c. 3.2 10-19 C.
d. zero.
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