Waves Questions and Answers

art Consider two waves traveling through the ame medium in the same time frame A B Mmm Compare the wavelengths part 2 of 4 Compare the amplitudes part 3 of 4 Compare the frequencies A and B have the same wavelength 2 Cannot be determined 3 A has the longer wavelength 4 B has the long 1 wavelength Cannot be determined 2 A has the smaller amplitude 3 A and B have the same amplitude 4 B has the smaller amplitude 1 B has the higher frequency 2 A has the higher frequency SUBMIT A SUBMIT A SUBMIT A

Problem 4 A laser with wavelength 656 nm is incident on a diffraction grating with 1600 lines mm a 15 points Find the smallest distance from the grating that a converging lens with focal length of 20 cm be placed so that the diffracted laser light converges to a point 1 0 meter from the grating b 15 points If a screen is placed at the location from part a how far apart will the two first orde beams appear on the screen If you did not solve part a use a distance of 0 5 m

Match the following wave quantities to the mini definition How fast the wave moves through the medium How long the wave is How often the particles vibrate about their fixed position How much time it takes the particles to complete a vibrational cycle How far the particles vibrate away from their resting position Choose Choose period frequency amplitude wavelength speed

Select one O a neither reflected nor inverted O b inverted but not reflected O c reflected and inverted O d reflected but not inverted

Like a transverse wave a longitudinal wave has Select one O a amplitude frequency wavelength and speed O b amplitude frequency and wavelength O c amplitude frequency and speed O d amplitude wavelength and speed wavelength speed and frequency e

A wave is introduced into a coiled Slinky A crest on the wave is observed to move a relatively long distance in a short amount of time This observation would lead one to believe that the wave has a Select one O a a fast speed Ob high amplitude Oc high frequency Od long wavelength

What does the period of a wave refer to Select one O a How long the repeating pattern of crests and troughs is O b How fast a crest of the wave moves along the medium O c How much time it takes a particle of the medium to complete a full cycle of vi Od How far particles of the medium are displaced from their rest position

A 4 foot spring measures 8 feet long after a mass weighing 8 pounds is attached to it The medium through which the mass moves offers a damping force numerically equal to 2 times the instantaneous velocity Find the equation of motion if the mass is initially released from the equilibrium position with a downward velocity of 9 ft s Use g 32 ft s2 for the acceleration due gravity x t Find the time at which the mass attains its extreme displacement from the equilibrium position t What is the position of the mass at this instant The extreme displacement is x feet

E The speed of light is 3 x 10 m s 300 000 000 m s A light wave has a wavelength c 400 nm 0 0000004 m What is the frequency of the light wave mala

A radio wave has a wavelength of 3 12 m and a frequency of 96 1 MHz 1 MHz 1 000 000 Hz What is the speed of the wave

2 Summarize the major characteristics of wave motion

1 How do your observations in Sections B and Section C support the wave equation in which v f

For questions 4 8 a when they meet b when they pass one another 4 5 the resuns or wave a and 6

7 Describe the magnitude of the displacement when two pulses meet in the spring when they are both on the same side

12 Reflection of a pulse from a less rigid medium has what effect on its phase

10 Use the whiteboard at the top of the submission box and draw the pulses after they pass through each other a b

3 Where in your environment can you observe some of the general properties of wave motion

9 What happens if the two pulses are in phase

8 Describe what happens when two pulses of equal amplitude when two pulses meet in the spring when they are on opposite sides

6 Compare the wavelengths of waves with higher frequencies with the wavelengths of waves with lower frequencies

2000m 5 A light wave traveling through a vacuum has a frequency of 6 67 x 10 4 Hz has what wavelength Hint The speed of light in a vacuum is always 3x10 m s

culate the speed of a wave that has a frequency of 842 Hz and a wavelength of 2 07 m

The wavelength of a wave is 4 9 m and its period is 0 9 s a What is the speed of the wave b What is the time required for the wave to travel 175 m

2 Give examples of other transverse waves

The difference in frequency between the first and the fifth harmonic of a standing wave on a taut string is f5 f1 50 Hz The speed of the standing wave is fixed and is equal to 10 m s Determine the difference in wavelength between these modes OA5 A1 0 64 m OA5 A1 1 60 m O A5 A1 5m OA5 A1 0 80 m OA5 A1 0 20 m

5 Compare the speeds of waves of different amplitudes and frequencies in a given medium

The diagram below right shows two pulses a square pulse and a triangle pulse approaching each other along the same medium Before Interference Select one O a D O b A O c B Diagram A Diagram B Diagram D Diagram C Which diagram shows the shape of the medium when they are completely interfering

In a classroom demonstration students are using a slinky to observe and learn about wave properties If the slinky has a period of 0 333 seconds what is the frequency 29 Hz 3 Hz 30 Hz O2 Hz

Find the answer to the question below using Mersenne s law f F 2L W where L represents length F is the tension and W is the linear density of the string A certain stretched string has a fundamental frequency of 100 Hz In order to double its fundamental frequency to 200 Hz the following can be done EXCEPT for Double the diameter of the string but keep the same mass Halve the length of the string Quadruple the tension in the string Quadruple the linear mass density of the string

A sound wave is determined to have a frequency of 1 000 Hz and a wavelength of 35 cm What is the speed of this wave 230 m s 600 m s 240 m s 350 m s

The canonic moment p is quantized by P i V Show that the Bloch function Ynk eikrunk r

Which of the following is NOT TRUE about modes A mode is the simplest form of oscillation at a fixed frequency O The actual vibration of a string consists of many modes of oscillation O A mode is made up of a combination of harmonic series The standing wave of second harmonic on a stretched string is a mode of oscillation

The figure shows the position versus time graph of a particle in oscillatory motion Determine the period of oscillation T x AA 1 3 5 7 A 0 25 S 0 50 s 4 0 s 8 0 s 2 0 s 1 S

What happens to the wavelength of electromagnetic waves as their frequency increases WF happens to their speed Assume they are traveling in a vacuum

8 Suppose that a 2 meter wave encounters an obstacle of width 20 cm Will the diffraction of the wave be large or small Explain your answer 10 points

wave 1 wave 2 AA The red and blue waves interact with each other and result in the purple wave shown What type of wave interference is this and how does the resulting purple wave compare to the red and blue waves a This is destructive interference resulting in the purple wave having a higher frequency than the red or blue waves Ob This is constructive interference resulting in the purple wave having a high frequency than the red or blue waves Oc This is destructive interference resulting in the purple wave having less energy than the red or blue waves d This is constructive interference resulting in the purple wave having less energy than the red or blue waves

A sound wave with a power of 8 8 x 10 4 W leaves a speaker and passes through section A which has an area of 5 0 m 2 What is the intensity of sound in this area Intensity 1 Power Area O 1 8 x 10 4 W m 2 O 1 8 x 10 6 W m 2 O 1 6 x 10 4 W m 2 O 1 6 x 10 6 W m 2 If the amplitude of a wave increases by a factor of 4 how is the intensity changed Oit increases by a factor of 4 Oit increases by a factor of 16 Oit decreases by a factor of 4 Oit decreases by a factor of 16

Wave interference occurs for elect one a sound waves Ob light waves Oc water waves d All of the above choices are correct Oe None of the above choices are correc

Two single wave pulses are sent along a rope Both have the same height but one is upward and the other is downward As they are passing through each other they will momentarily cancel each other out What becomes of their energy as they are passing through each other a It is momentarily destroyed due to destructive interference b it is still there in the form of thermal energy of the rope and air c actually the pulses contained no energy to begin with d it is still there in the form of gravitational energy of the rope e It is still there in the form of kinetic energy of the rope

Two waves have different frequencies but equal amplitudes The one with higher frequency has the a greater speed b longer wavelength c greater energy d all of the above e none of the above

If the amplitude of the fundamental for a certain sawtooth wave is 2 5 volts what is the amplitude of the 4th harmonics Answer in units of volts and round to two decimal places

What is the fourth resonant frequency of an open tube 16 3 cm long Answer in units of Hz and round to the nearest integer Hints a For an open tube the wavelength of the 1st harmonic is twice the length of the tube A 2L L L 1 12 b Speed of sound in air is 345 m s Use v Af to find the frequency of the 1st harmonic fundamental frequency c For an open end tube all harmonics are allowed The fourth resonant frequency should be the 4th harmonic of the fundamental frequency 10 poin

Which correctly shows the waves pulses afterwards O 5 cm 15 cm 5 cm 5 cm 10 cm 5 cm 10 cm 10 cm

By tapping his finger on the surface of a pond Tom sends out waves at a frequency of 3Hz If the wavespeed is 2 m s find the wavelength of these waves Edit View Insert Format Tools Table

Ocean waves with a wavelength of 60 m are arriving at a rate of 8 per minute what is their speed a 4 m s Ob 7 5 m s O c 8 m s O d 64 m s O e 480 m s

ow does a sounding board illustrate resonance for sound waves

A thick power line of length 75 m is stretched taut between two poles experiencing a tension force of 6250 N The mass of the power line 750 kg What is the maximum resonate frequency of the cable if the wavelength is exactly 1 3 the length of the cable

You want to create an upright image of an object that is five times the height of the object The object must be located 12 0 cm in front of the lens used What is the focal length of the lens and is it a converging or diverging lens Select one O a 9 60 cm Converging 15 0 cm Converging 15 0 cm diverging 9 60 cm diverging O b O C O d

15 6 pts Standing waves form on a 0 4 m long string both ends fixed when it is plucked The string is under 800 N of tension and has a linear pass density of 0 03 kg m a What is the velocity of waves on this string b Are the ends of the string nodes or anti nodes c What is the frequency of the fundamental 1st harmonic and second harmonic

A pendulum consists of a small rock hanging from a string of length 0 67 m Pull the rock sideways and release it from rest to set the pendulum in motion How long after releasing it does it take to attain its greatest speed the first time S