Magnetism & Electromagnetism
What is the source of magnetic fields?
What are moving charges?
What happens to light when it reflects from a flat surface?
What is angle of incidence = angle of reflection?
What determines the speed of a wave?
What are the properties of the medium?
What is a photon?
What is a quantum or "packet" of light?
What direction is magnetic force relative to velocity?
What is perpendicular?
What happens to magnetic force if velocity of a charged particle doubles?
What is doubles?
What happens to light when it enters a denser medium?
What is it slows down and bends toward the normal?
If frequency increases and speed is constant, what happens to wavelength?
What is decreases?
What happens to photon energy as frequency increases?
What is increases?
What happens to image size as object moves closer to a converging lens?
What is image gets larger?
A wire carries current upward. What is the direction of the magnetic field around it?
What is counterclockwise?
An object is 20 cm from the lens and produces an image that is on the same side as the object but at a distance of 45 cm. What is the magnification?
What is m = 2.25?
What condition produces constructive interference?
What are waves aligning in phase?
A photon has a frequency of 6.0×1014 Hz. What is the energy of this photon?
What is 3.98 x 10-19 J?
A wave’s amplitude increases. What happens to energy?
What is the energy increases?
An electron is moving in the +x-direction due to a force that is directed in the -y-direction. What is the direction of the magnetic field?
What is upward/+z-direction/out of the page?
An object is placed inside the focal length of a converging lens. Describe the image.
What is virtual, upright, larger?
Light passes through a double slit. What determines spacing of bright fringes?
What is wavelength, distance to the screen, and distance between the slits?
Increasing light intensity affects what in the photoelectric effect?
What is increases the number of electrons?
A loop of wire is completely inside a uniform magnetic field and is not moving. The magnetic field strength is steadily increasing. What happens to the induced current in the loop?
What is a constant current is induced?
A proton enters a uniform magnetic field of 0.20 T perpendicular to its velocity at a speed of 3.0×106 m/s. What is the radius of the circular path of the proton?
What is 0.16 m?
A lens has focal length 10 cm and object distance 20 cm. What is image distance?
What is 20 cm?
Light of wavelength 600 nm passes through a double slit with slit separation 2.0×10−4 m. The screen is 2.0 m away. What is the distance between adjacent bright fringes on the screen?
What is d = 6.0 x 10-3 m?
A radioactive nucleus undergoes beta-minus (β⁻) decay. How does the atomic number and mass of the nucleus change?
What is atomic number increases by 1, while atomic mass remains unchanged?
A stationary circular loop of wire with radius r and resistance R is placed in a uniform magnetic field. The magnetic field is directed into the page. The magnitude of the magnetic field increases at a constant rate from an initial value of B0 to a final value of 3B0 over a time interval Δt. Determine the direction of induced current (CW or CCW) and an algebraic expression for the magnitude of the induced current I in terms of r, R, B0, and Δt. Hint: V = IR where V is voltage/induced emf
What is CCW and I = (2B0πr2)/(RΔt)?