A ball is dropped from a rooftop of a building and falls for two seconds. The acceleration of gravity is 9.8 m/s2 . The ball is referred to at the two second time. The distance the ball is below the rooftop in meters is
a. 0 d. 6
b. 4.9 e. none of these
c. 9.8
[Ques. 2] Light incident on a thin film is reflected and transmitted at each surface. Why does a thin film have to be thin for an interference pattern to form?
a. Light would not penetrate a thick film.
b. The surfaces of the film must be as close to perfectly parallel as possible. Irregularities would be magnified in a thick film.
c. The thickness of the film must be less than the wavelength of light.
d. Light is not slowed down when it enters into a thin film.
e. Light speeds up as it enters a thin film.
[Ques. 3] A ball thrown upwards reaches a maximum height and then comes back down to the original level. When a body moves in circular motion at constant speed
a. the velocity and acceleration point in the same direction
b. the velocity and acceleration point in opposite directions
c. the velocity and acceleration point perpendicular to each other
d. the acceleration is zero
e. none of the above
[Ques. 4] What determines the smallest angular separation that two objects can have and, ideally, show up in a photograph as two separate objects?
a. How far away the objects are.
b. The shutter speed of the camera.
c. The size of the opening that lets the light into the camera lens and the wavelength of the light.
d. Just the wavelength of the light.
e. Just the size of the opening that lets in the light into the camera.
[Ques. 5] As the ball is going downwards
a. the velocity and acceleration both point up
b. the velocity points up and the acceleration down
c. the velocity points down and the acceleration up
d. the velocity and acceleration both point down
e. the acceleration is zero
[Ques. 6] Diffraction takes place:
a. on highly reflective surfaces.
b. on rough surfaces.
c. around the edges of barriers.
d. for waves moving through empty space.
e. in the center of shadows.
[Ques. 7] A ball thrown upwards reaches a maximum height and then comes back down to the original level. At the maximum height
a. the velocity and acceleration both point up
b. the velocity points up and the acceleration down
c. the velocity points down and the acceleration up
d. the velocity and acceleration both point down
e. the velocity is zero
f. the acceleration is zero
[Ques. 8] Which produces the narrowest diffraction pattern?
a. white light
b. violet light
c. yellow light
d. red light
e. green light
[Ques. 9] A ball thrown upwards reaches a maximum height and then comes back down to the original level. As the ball is going upwards
a. the velocity and acceleration both point up
b. the velocity points up and the acceleration down
c. the velocity points down and the acceleration up
d. the velocity and acceleration both point down
e. the acceleration is zero
[Ques. 10] This photo shows the diffraction pattern in the shadow of a penny. If light bends around the edges of a penny to produce a bright spot exactly at the center, why are there no bright spots in places other than the center?
a. There are additional spots, but the one in the center is brightest.
b. The penny acts like a lens and the bright spot is simply a tiny image of the penny.
c. The center is equidistant from all parts of the penny's edge, therefore waves arrive in step at the center to add and produce a bright spot, but arrive out of step and cancel elsewhere.
d. Superposition and interference of waves from the light occurs only at the center.
e. The bright spot is merely an optical illusion.
Quick Reply
