Sum, physics

• What kind(s) of interference can occur between two identical waves moving in opposite directions?

  Constructive interference only
• Pure constructive interference occurs between two waves when they have the same _____.

  •frequency and are in phase
• Which of the following is an evidence that light is a form of wave?

  -Light can meet each other and produce fringes or bright and dark regions on a screen behind.
• What principle is responsible for alternating light and dark bands when light passes through two or more narrow slits?

  -interference
• What principle is responsible for light spreading as it passes through a narrow slit?

  -diffraction
• The condition in which image is formed in front of the retina is called

  -Defect of vision
• In most cameras the location of the image is adjusted to appear on the film by changing the

  -position of the lens.
• For a converging lens, a ray arriving parallel to the optic axis

  -passes through the principal focal point.
• As the angle of incidence is increased for a ray incident on a reflecting surface, the angle between the incident and reflected rays ultimately approaches what value?

  -180 degrees
• Which light bends most when white light passes through a prism?

  -violet
• What type of reflection does fiber optic technology rely upon?

  -Total internal reflection
• What do you call the bending of light rays as they pass obliquely from one medium to another medium?

  -refraction
• What will be the arrangement of electromagnetic waves if we will arrange them according to decreasing energy?

  -X-ray, light, radio
• Which of the following color has the longest wavelength?

  -red
• What are the two main applications for ac?

  -power, information
• If the N pole of a bar magnet is held motionless inside the large coil, how will the galvanometer deflect?

  -no deflection
• If the N pole of a bar magnet is quickly thrust into the opening of the large coil that faces you, how will the galvanometer deflect while the magnet is moving into the coil?

  -positive deflection
• In Lenz’ law, what is the direction of induced current? It always______

  -opposes the cause.
• What does Lenz devise? A rule to find out the direction of _________

  -current induced in a circuit.
• “Moving the magnet toward or away from the coil.” “Moving a current carrying coil toward or away from the coil.” Based from these actions, what do they have in common?

  -All these actions do induce a current in a coil
• What device was used in conducting various experiments such as with magnetically induced emf by Faraday?

  -Galvanometer
• If the magnetic flux through an area bounded by a closed conducting loop changes with time, a current and an emf are produced in the loop, what do you call this process?

  -Induction
• From the definition of magnetic flux, which of the following is the SI unit for magnetic flux?

  -Wb
• A vector quantity which defined as the dot product of the magnetic field and the area vector.

  -Magnetic Flux
• A battery with a terminal voltage of 12V is connected to a circuit consisting of four 10 Ω and one 5 Ω resistor all in series. Assume the battery has negligible internal resistance. Calculate the current through each resistor.

  -0.3 A
• What is the systematic way of solving multi-loop circuits that includes complex networks which quantify how current flows through a circuit and how voltage varies around a loop in a circuit?

  -Kirchhoff’s law
• This component within a circuit that limits the flow of charge.

  -Resistor
• Two resistors (R1=50 Ω and R2=500Ω) are connected in parallel. What is the resistance of the two resistors together?

  -65 Ω
• When you remove a bulb from a three-bulb circuit, and the other two bulbs go off, then the bulbs must have been connected in __________.

  -Series
• What are the two types of connection which binds electrical devices in a circuit?

  -Series – Parallel
• If the resistance in a circuit with constant voltage increases, the current will

  -Decrease
• An electric kettle with 50-Ω heat element is powered by a 230-V wall outlet. The current flowing through kettle is:

  -4.6 A
• If doubling the voltage across a resistor doubles the current through the resistor, then

  -The resistor value did not change
• The statement which correctly represents Ohm’s law:

  -V = IR
• With respect to the capacitor, which relationship is true?

  -V = Q/C
• In the capacitor, the dielectric can be made out of all sorts of ----------materials and the plates are made of a ------------material.

  -insulating, conductive
• What is created out of two metal plates and an insulating material called a dielectric?

  -A capacitor
• What is the voltage across the plates of the capacitor if the capacitance is 10 uF and the Charge stored is 30 uC?

  -3 V
• How can we increase the capacitance of a parallel-plate capacitor?

  - increasing the charge

  -decreasing the plate separation
• What is the SI unit for capacitance?

  -farad