Physics Flashcards
7 cards from real Regents practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Physics flashcards as text
An electron moves perpendicular to a magnetic field. The magnetic force on the electron acts:
Answer: Perpendicular to both its velocity and the field
The magnetic force on a charged particle is F = qv × B, which is always perpendicular to both the velocity and the magnetic field.
Which phenomenon provides evidence that light behaves as a wave?
Answer: Diffraction
Diffraction—the bending of light around obstacles—is a wave behavior that demonstrates the wave nature of light.
A 60 W light bulb operates on a 120 V circuit. What is the current through the bulb?
Answer: 0.5 A
P = IV, so I = P/V = 60/120 = 0.5 A.
Which of the following best explains why a compass needle points north?
Answer: The Earth acts as a giant magnet with a magnetic south pole near geographic north
Earth's geographic north pole is near its magnetic south pole; since opposite poles attract, the compass needle's north pole points toward it.
An object in uniform circular motion experiences a centripetal acceleration directed:
Answer: Toward the center of the circle
Centripetal acceleration always points toward the center of the circular path.
What is the index of refraction of a material in which light travels at 2.0 × 10⁸ m/s? (c = 3.0 × 10⁸ m/s)
Answer: 1.5
n = c/v = (3.0 × 10⁸)/(2.0 × 10⁸) = 1.5.
Which statement about momentum is correct for an isolated system?
Answer: Total momentum is conserved
The law of conservation of momentum states that in an isolated system, total momentum remains constant.