ib 4.5 standing waves 1

Question 1 Two strings X and Y have the same tension and length and are made of the same material but the diameter of Y is twice that of X. I frequency of X is 200 Hz the frequeny of Y is

• A 100 Hz
• B 150 Hz
• C 50 Hz
• D 33 Hz

Question 2

• A Violin
• B Guitar
• C Flute
• D Clarinet

Question 3 Which of the following makes the velocity of a wave in a stretched string greater?

• A tightening
• B plucking harder
• C using a thicker string
• D shortening the string

Question 4 The 1st harmonic of a closed pipe of length L is 300 Hz. To play the same note on an open pipe the length of the pipe could be

• 
• 
• 
• 

Question 5 A stretched string is plucked and a note of 150 Hz is produced. The frequency of the third harmonic is

• A 50 Hz
• B 100 Hz
• C 300 Hz
• D 450 Hz

Question 6 The animation shows a standing wave in a stretched string. If the wavelength of the wave is 10 cm, the length of the string is

• A 5 cm
• B 20 cm
• C 10 cm
• D 15 cm

Question 7 The following animations represent waves. Which ones are standing waves?

• A just the first
• B the second and third
• C all of them
• D none of them

Question 8 A sound wave of frequency 100 Hz meets with one of frequency 150 Hz travelling in the opposite direction. The result is

• A a standing wave of frequency 125 Hz.
• B a standing wave of frequency 250 Hz
• C complete cancellations of the sound wave.
• D no standing wave

Question 9

• A
• B
• C
• D

Question 10

• A a node
• B an antinode
• C neither node nor antinode
• D midway between a node and antinode