1. Total internal reflection occurs when a beam incident at an interface between
ID: 3160735 • Letter: 1
Question
1. Total internal reflection occurs when a beam incident at an interface between two materials is entirely reflected instead of passing through. Which must be true about the indices of refraction for the two materials if total internal reflection occurs? Consider the beam to be coming from material 1 and encountering the interface with material 2.
Select one:
a. The indices of refraction must be the same
b. The index of refraction of material 1 must be less than that of material 2
c. The index of refraction of material 1 must be greater than that of material 2
d. The index of refraction of material 2 must be greater than that of material 1
2.
Which property of a sound wave is changed to increase the volume of the wave?
Select one:
a. Amplitude
b. Frequency
c. Wavelength
d. Phase
3.
In a circuit with a battery and a switch that has several light bulbs wired in series, the circuit is connected by the light bulbs do not shine. Which of the following could NOT result in the lights beginning to shine?
Select one:
a. Replacing the battery
b. Adding a second identical battery
c. Removing one or more light bulbs from the circuit
d. Removing one or more light bulbs from its socket, but leaving the sockets in the circuit
4.
You have an unknown bar magnet and you want to label the poles N and S. Which is NOT a way you could determine the poles?
Select one:
a. Find the pole attracted to the south pole of another magnet. Label it south.
b. Float the magnet in a light paper cup in a basin of water. Label the north-pointing pole north.
c. Place a compass near the magnet. Locate the pole the compass points toward, and label it south.
d. Find the pole that is repelled from the north pole of another magnet. Label it south.
Explanation / Answer
1. Light incident upon a medium with lesser index of refraction value, the incident light bend away from normal. The angle of exit becomes greater incident angle. This is internal reflection.
Answer will be C ( The index of refraction of material 1 must be greater than that of material 2)
2. Increase in volume is actually increase in amplitude of sound.
Answer will be A (amplitude)
3. when you remove bulb (remove socket or not) there will be some shine increase.as the resistance in the circuit decrease. V=IR so as R decrease I increase. The main parameter for bulb glow is current through a bulb.
If you replace battery and use same specification battery. generally mAh rating of battery there will be no change in situaition.
IF you add extra battery in paraller (two batteries in parallel) the current will be doubles (battery current supply). There is a change for bulb to shine.
Answer will be A (Replacing the battery)
4.Same poles of different magnet repel each other.Opposite poles attract each other.
Answer will be A (Find the pole attracted to the south pole of another magnet. Label it south.)
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