Questions 26 to 30 | MJ23, P11| Cambridge International AS & A Level Physics

Cambridge International AS & A Level Physics May June 2023 Paper 11 Questions 26 to 30
26 A string is stretched between a vibration generator and a fixed point.
When the vibration generator is vibrating at a frequency f, a stationary wave with five nodes is created on the stretched string, as shown. There is a node at the end of the string that is attached to the vibration generator. The frequency of vibration of the vibration generator is slowly increased.
What is the next frequency that produces a stationary wave on the string?
27 A ripple tank and a barrier with a single gap are used to demonstrate the diffraction of surface ripples on water. Initially, the wavelength of the ripples is five times smaller than the gap in the barrier. Which change increases the amount of diffraction observed?
28 A laser produces a beam of light of wavelength 650 nm. The beam is incident normally on two slits that are a distance of 0.12 mm apart.
A screen is placed parallel to the slits. The bright interference fringes on the screen have a separation of 7.5 cm. What is the distance between the screen and the two slits?
29 A beam of light from a laser is incident normally on a diffraction grating. The diagram shows only the second-order maxima that are produced.
The grating has a line spacing of 1.0  10-6 m. The angle between the two second-order maxima is 110. What is the wavelength of the light?
30 The electric current in a metal wire is 4.0 mA.
How many electrons pass a fixed point in the wire in a time of 10 hours?