1A wave on a string goes from a thin string to a thick string. What picture best represents the wave some time after hitting the boundary?ABCDBeforequestion 3BThe sound intensity of an ipod earphone can be as much as 120 dB. How is this possible? A) The ipod is very powerfulB) The area of the earphone is very smallC) The ipod is a digital deviceD) Rock music can be very loudQuestion 1BQuestion 2The sound level in a truck is 20 dB greater than the sound level in a Strarbucks cafe. If the intensity in the cafe is 10-7W/m2 the intensity in the truck is_______ W/m2.A)20 X10-7B)10-9C)10-5D) 20CQuestion 1A cylinder 2.5 cm in length is closed at one end andopen at the other end. Find the frequency of the third harmonicof the standing wave in the column. vair=340 m/sA) 340 HzB) 1,020 HzC) 3,400 HzD) 10,200HzDClicker Question 1A fire truck is going down the street toward a stationary observer sounds an alarm with a frequency fs. Which of these is true of the frequency heard by the observer.A. The frequency is higher because the wavelength of the sound in air is lengthened.B. The frequency is higher because the wavelength of the sound in air is shortened.C.The frequency is higher but the wavelength of the sound in air is the same as for a stationary truck.D.The frequency is higher because the speed of sound in air is faster.BClicker Question 2A Doppler shifted radar beam is reflected off a car going 30m/s coming directly toward a stationary police car. If the frequency of the radar is 1.00x1010 Hz. The beat frequency of the reflected beam with the stationary source is. (speed of light is 3.00x108m/s)A. 1x102 HzB. 2x102HzC. 1x103HzD. 2x103HzD2Question 1A radio station has a dipole antenna in the vertical direction transmitting radio waves. You have a radio with a dipole antenna that detects the electric field of the radio waves. To get the maximum signal you should point the antenna ________.A) horizontally in the East- West directionB) horizontally in the North-South directionC) in the vertical directionD) in any directionCquestion 2The door in a microwave oven is glass with a metal screen and blocks microwaves from escaping. The reason why you can see the food but not feel the heat is that_____.A) Microwaves cannot pass through glass.B) The size on the holes in the screen are larger than the wavelength of light but smaller than the wavelength of microwaves.C) The microwaves are completely absorbed in the oven.D) The microwaves are directed only in the vertical direction.Bquestion 1Light passes through an interface from air to glass. Which statement is false.A.The frequency remains the sameB.The wavelength decreasesC.The frequency decreases. D.The speed of light decreasesCquestion 2When light goes from air into glass the angle of refraction is ______ the angle of incidence.A) greater thanB) less thanC) equal toBQuestion 1For total internal reflection at an interface the light ____. A) must have a small angle of incidence B) must go from a higher to lower index of refraction.C) must go from a lower to higher index of refraction.D) can go from either a higher or lower index of refractionBQuestion 2Light is refracted in going from air to glass.The angle of refraction is _______ for blue light than for red light.A) greaterB) lessC) the sameD) none of the aboveB3Clicker Question 1A boy stands 0.4 m in front of a concave mirror with a radius of curvature of 1.0 m. His image will be _________.A) real and uprightB) real and invertedC) virtual and uprightD) virtual and invertedCClicker Question 2A boy stands 0.5 m from a convex mirror with a radius of curvature of 1.0 m. The magnification will be between ______.A) 0 and 1.0B) 1.0 and infinityC) 0 and – 1.0D) - 1.0 and – infinity.Aquestion 1Where would an object be placed in front of the converging lens below, in order to produce a real, enlarged image? A•fBCDBquestion 2Where would an object be placed in front of the converging lens below, in order to produce a virtual, enlarged image? A•fBCDCClicker question 1You are looking at the reflection of the sun from the surface of the ocean at the polarization angle. The E field of the reflected light is _____.A) highest in the horizontal directionB) highest in the vertical directionC) the same in all directionsD) zero AClicker question 2Suppose you have two polarizers with an angle of 90o. What will happen if a third polarizer is placed in between the two?A) nothing will changeB) the transmitted light will decreaseC) the transmitted light will increaseD) the transmitted light will go to zeroC4Clicker Question 1In a two slit interference experiment, how does the separation between peaks in the interference pattern change if the distance between slits is increased?A. IncreaseB. DecreaseC. Stays the sameD. IndeterminateBClicker Question 2In a two slit interference experiment how does the distance between the peaks on the screen change if the wavelength of the light is increased?A. increasesB. decreases C. stays the sameD. indeterminateAClicker question 1Light with a wavelength of 500 nm is passed through a slit with a width a= 1 mmThe first minimum in the diffraction pattern will occur at an angle of about ________.A) 1 radianB) 10-1radianC) 10-3 radianD) 10-5 radianCClicker question 2If light with a shorter wavelength is used in the experiment. The angle will be _____.A) increasedB) decreasedC) remain the sameD) uncertainBClicker question 1Photons with λ=250 nm (5.0eV) hit a metal surface and emit photoelectrons with a maximum KE of 1.0 eV. What is the work function of the metal?A) 1.0 eVB) 2.0 eVC) 3.0 eVD) 4.0 eVDClicker question 2In a photoelectric effect experiment the following data was obtained with two different metals.fKEmaxABWhich metal has the larger work function?A) AB) BB5Clicker question 1Suppose the rule for the orbital angular momentum quantum number is that l can have values from 0 to n. (instead of n-1) The number of electrons in the n=1 shell would beA. 2B. 6C. 8D. 108Clicker question 2The noble gas Kr has Z=36 and a outer electron configuration of 3d10, 4s2, 4p6. The next noble gas is Xe Z=54. The electrons to be added will be in the following subshells.A. 4dB. 4d 5sC. 4d 5s 5pD. 4d 5s 5p 5dCClicker question 1The amount of 14C in the atmosphere is relatively constantbecause it is generated by a nuclear reaction. Whenit is fixed by incorporation plant or animal material it decayswith a half life of 5730 years. This can be used to determinethe age of