Stationary Wave

A stationary wave of frequency 80.0 Hz is set up on a stretched string of length 210 cm. What is the speed of the waves that produce this stationary wave?

• 56.0 m/s

• 112 m/s

• 5600 m/s

• 11 200 m/s

Sound waves of frequency 100 Hz are transmitted into a cylindrical tube that is closed at one end. The stationary waves formed in the tube produced adjacent nodes that are 1.6 m apart. What is the speed of the sound wave?

• 62.5 m/s

• 320 m/s

• 160 m/s

• 640 m/s

In a closed organ pipe, if the generated sound’s wavelength λ, the second overtone of the string is achieved if the string’s length is equal to . . . .

• 0.5λ

• 1.5λ

• 2λ

• 2.5λ

The diagram shows a standing wave on a string. The standing wave has three nodes N1, N2 and N3. Which statement is correct?

• All points on the string vibrate in phase.

• All points on the string vibrate with the same amplitude.

• Points equidistant from N2 vibrate with the same frequency and in phase.

• Points equidistant from N2 vibrate with the same frequency and the same amplitude

A closed organ pipe, A is blown concurrently with closed organ pipe, B. In fact, base tone A organ pipe is same high with first up tone of B organ pipe. Comparison of A and B pipe length is . . . .

• 1 : 1

• 1 : 3

• 1 : 2

• 1 : 4

At an open pipe, if the generated sound’s wavelength is λ, the fifth harmonic frequency will be obtained if the pipe’s length is . . . .

• 0.5 λ

• 2.0 λ

• 1.5 λ

• 2.5 λ

A closed organ pipe with 25 cm length generates the second overtone. If propagation speed of sound in air is 340 m/s, the frequency of the tone is . . . .

• 1,300 Hz

• 1,700 Hz

• 1,500 Hz

• 1,900 Hz

First up tone of open organ pipe that in 40 cm length has resonance with closed pipe. If at time of resonance total node of both pipes is similar, length of closed organ pipe (in cm) is . . . .

• 15

• 30

• 45

• 50

• 60

The speed of a transverse wave on a stretched string can be changed by adjusting the tension of the string. A stationary wave pattern is set up on a stretched string using an oscillator set at a frequency of 650 Hz. How must the wave be changed to maintain the same stationary wave pattern if the applied frequency is increased to 750 Hz?

• Decrease the speed of the wave on the string.

• Decrease the wavelength of the wave on the string.

• Increase the speed of the wave on the string.

• Increase the wavelength of the wave on the string.

A transmitter of electromagnetic waves is placed 45 cm from a reflective surface. The emitted waves have a frequency of 1.00 GHz. A stationary wave is produced with a node at the transmitter and a node at the surface. How many antinodes are in the space between the transmitter and the surface?

(Speed of electromagnetic wave 3 x 10^8 m/s)

• 1

• 2

• 3

• 4