11grade 4 term Standing waves

The diagram shows a stationary wave on a string at two instants of maximum vertical displacement. The frequency of the wave is 12 Hz. What is the speed of the wave?

• 3.6 m s ^-1

• 7.2 m s ^-1

• 360 m s ^-1

• 720 m s ^-1

A stationary wave on a streched string is set up between two points P and T. which statement about the wave is correct?

• point R is at a node

• points Q and S vibrate in phase.

• The distance between P and T is three wavelengths.

• The wave shown has the lowest possible frequency.

A stationary wave is set up on a streched string, as shown. Which statement about the points on the string is correct?

• Point Q vibrates with the largest amplitude.

• Points P and R vibrate in phase.

• Point S is an antinode.

• The horizontal distance between R and S is half the wavelength.

The diagram shows a sketch of a wave pattern, over a short period of time. Which description of this wave is correct?

• The wave is longitudinal, has a wavelength of 20 cm and stationary.

• The wave is transverse, has a wavelength of 20 cm and stationary.

• The wave is transverse, has a wavelength of 40 cm and progressive.

• The wave is transverse, has a wavelength of 40 cm and stationary.

the three waves shown in each diagram have the same amplitude and frequency but differ in phase. They are added together to give a resultant wave. In which case is the resultant wave zero?

• 
• 
• 
• 

A stationary sound wave has a series of nodes. The distance between the first and the sixth node is 30.0 cm. What is the wavelength of the sound wave?

• 5.0 cm

• 6.0 cm

• 10.0 cm

• 12.0 cm

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 stirng vibrate in phase

• All points on the string vibrate with the same amplitude

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

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

To produce a stationary wave, two waves must travel in opposite directions through the same space. Which statement about the properties of the two waves must also be true?

• The waves must have equal frequency, but a different speed and wavelength.

• The waves must have equal speed, but a different wavelength and frequency.

• The waves must have equal speed, frequency and wavelength.

• The waves must have equal wavelength, but a different speed and frequency.

A microwave transmitter emits waves towards a metal plate. The waves strike the plate and are reflected back along their original path. A microwave detector is moved along the line PT. Points P, Q, R, S and T are the positions where minima of intensity are observed. These points are found to be 15 mm apart. What is the frequency of the microwaves?

• 5.0 GHz

• 6.7 GHz

• 10 GHz

• 20 GHz

Where, in a standing wave, do the vibrations of the medium occur?

• only at the nodes

• only at the antinodes

• at all points between the nodes

• at all points between the antinodes