If the period of a pendulum is 1.2 s, what is the length of the…

QuestionIf the period of a pendulum is 1.2 s, what is the length of the…If the period of a pendulum is 1.2 s, what is the length of the pendulum?AnswersA.1.3 mB.1.0 mC.0.75 mD.0.36 mQuestion16.A spring stretches 14 cm when an object weighing 28 N is hung from it. What is the spring constant?AnswersA.1.4 x 102 N/mB.1.8 x 102 N/mC.2.0 x 102 N/mD.14 x 102 N/mQuestion17.The diagram shows a spring stretched by the weight of a block. If the block weighs 34 N, what potential energy is stored in the spring? AnswersA.2.0 JB.2.8 JC.3.5 JD.4.1 JQuestion18.Sound is produced when there are __________.AnswersA.increases in pressureB.oscillations in pressureC.increases in temperatureD.electromagnetic wavesQuestion19.The frequencies of vibrating air set into resonance are determined by the __________ of the air column.AnswersA.radiusB.massC.lengthD.widthQuestion20.Two fire-trucks with sirens on speed toward and away from an observer as shown below. Describe the effect produced by the truck on the left in terms of frequency.AnswersA.Frequency is increasing, resulting in higher pitch.B.Frequency is decreasing, resulting in higher pitch.C.Frequency is increasing, resulting in lower pitch.D.Frequency is decreasing, resulting in lower pitch.Question21.Resonance occurs when __________.AnswersA.no nodes are formedB.any destructive interference occursC.any constructive interference occursD.a standing wave is createdQuestion22.The pressure of a reflected wave is inverted __________ resonators.AnswersA.only in closed-pipeB.only in open-pipeC.in both open- and closed-pipeD.in neither open- nor closed-pipeQuestion23.In a standing sound wave in a pipe, nodes are regions of __________.AnswersA.maximum or minimum pressure and low displacementB.maximum or minimum pressure and high displacementC.mean atmospheric pressure and low displacementD.mean atmospheric pressure and high displacementQuestion24.In a standing sound wave in a pipe, two antinodes are separated by __________.AnswersA.one-quarter wavelengthB.a one wavelengthC.one-half wavelengthD.two wavelengthsQuestion25.The speed of sound increases by about __________ for each 1°C increase in temperature.AnswersA.0.1 m/sB.0.6 m/sC.1.6 m/sD.2.0 m/sQuestion26.Which of the following can use echoes to determine the distance to an object?AnswersA.batsB.camerasC.ships using sonarD.all of the aboveQuestion27.Tiny hair cells that detect sound are located in which part of the ear?AnswersA.the cochleaB.the auditory canalC.the eardrumD.the stapesQuestion28.When considering sound quality in musical terms, the difference between two waves with the same pitch but different combinations of harmonics is called __________, tone color, or tone quality.AnswersA.pitchB.shapeC.oscillatorD.timbreQuestion29.The loudness of sound as perceived by the ear and brain depends mainly on its __________.AnswersA.Doppler effectB.amplitudeC.velocityD.pitchQuestion30.Most sounds are __________ that comprise more than one frequency.AnswersA.vibrating objectsB.varying decibelsC.amplitudesD.complex wavesQuestion31.Two clarinet players are tuning their instruments. One plays a perfect G at 352 Hz. The other is slightly sharp and plays at 357 Hz. What is the beat frequency?AnswersA.2.5 HzB.5 HzC.7.5 HzD.10 HzMultiple ChoiceUse the information to answer questions 32 and 33. Question32.Which sound wave described in the table has a loudness of 60 dB?AnswersA.wave 1B.wave 2C.wave 3D.wave 4Question33.What is the wavelength of wave 4 in air? (The speed of sound in air is 343 m/s.)AnswersA.0.48 mB.0.95 mC.2.1 mD.2.5 mQuestion34.What determines the color of light?AnswersA.wavelengthB.temperatureC.surfaceD.distanceQuestion35.Which of these colors of light has the longest wavelength?AnswersA.blackB.violetC.greenD.redQuestion36.Which of these properties of light is a constant?AnswersA.wavelengthB.speed in a vacuumC.frequencyD.amplitudeQuestion37.The rate, in lumens, at which light is emitted from a lightbulb, is the bulb’s __________.AnswersA.luminous fluxB.illuminanceC.frequencyD.luminous intensityQuestion38.Which best describes the relationship between distance and illuminance?AnswersA.E ∝ rB.E ∝ r2C.E ∝ D.E ∝ Question39.Very thin, white tissue paper can best be described as __________.AnswersA.transparentB.translucentC.opaqueD.luminousQuestion40.The fact that sharp shadows are cast by the Sun is an indication that light __________.AnswersA.is a waveB.is made up of colorsC.travels in straight linesD.travels in a curved pathQuestion41.The mixing of primary colors of light to produce other colors is a(n) __________ process.AnswersA.refractiveB.diffractiveC.subtractiveD.additiveQuestion42.Combining the primary colors—red, blue, and green—forms __________ light.AnswersA.noB.whiteC.shiftedD.reflectedQuestion43.Polarized light consists of waves __________ with a specific pattern.AnswersA.fixedB.travelingC.oscillatingD.combingQuestion44.Which choice best describes an inverse-square relationship?AnswersA.Daylight on Mars is dimmer than daylight on Earth.B.A camera flashbulb produces a sudden burst of light.C.When you blow out a candle, the room darkens.D.Installing compact fluorescent bulbs reduces your electric bill.Question45.The wavelength of a beam of light passing through a vacuum is 420 nm. What is the frequency of the light beam?AnswersA.6.7 x 1013 HzB.5.4 x 1014 HzC.7.1 x 1014 HzD.3.8 x 1014 HzQuestion46.Which describes the combination of two primary colors of light to produce a secondary color of light?AnswersA.Yellow light and blue light combine to produce green light.B.Magenta light and cyan light combine to produce blue light.C.Red light and green light combine to produce yellow light.D.Green light and yellow light combine to produce white light.Question47.The illustration shows a lamp and a candle illuminating a screen positioned between them. If the lamp is moved to a distance r = 1.02 m, how much brighter must the lightbulb be than the candle to have the same illuminance on the screen? AnswersA.1.5 timesB.3 timesC.4.5 timesD.9 timesQuestion48.If the luminous flux of a lightbulb is 1750 lm, what is the illuminance of a surface 2.0 m from the light source?AnswersA.140 lxB.35 lxC.28 lxD.13 lxQuestion49.An architect is designing the lighting for a school. The illuminance in the classrooms must be at least 37 lx on students’ desks. If the light shining on each desk has a luminous flux of 4200 lm, how far above the desks should the lights be placed?AnswersA.1.0 mB.2.0 mC.3.0 mD.4.0 mQuestion50.Which of the following statements is true?AnswersA.Ordinary light contains only those waves vibrating parallel to its direction of travel.B.Ordinary light contains waves vibrating in every direction perpendicular to its direction of travel.C.Ordinary light contains waves vibrating in one direction perpendicular to its direction of travel.D.Ordinary light contains polarized waves.End NotesSciencePhysicsSCIH 036059Share Question