Question
A longitudinal wave is travelling from left to right. The graph shows the variation of the displacement of the particles with distance along the wave at one instant in time.
Displacements to the right are positive; displacements to the left are negative. Which labelled point represents a compression?
▶️Answer/Explanation
Ans: B
Question
A transverse progressive wave on a string has a wavelength of 12 cm and an amplitude of 1.5 cm. The speed of the wave on the string is 48 \(cms^{–1}\). What is the distance travelled by a point on the string in a time of 2.0 s?
A 12 cm
B 24 cm
C 48 cm
D 96 cm
▶️Answer/Explanation
Ans C
Question
Interference fringes of separation x are observed on a screen at a distance of 1.00 m from a double slit that is illuminated by yellow light of wavelength 600 nm. At which distance from the double slit would interference fringes of the same separation x be observed when using blue light of wavelength 400 nm?
A 0.33 m
B 0.67 m
C 0.75 m
D 1.50 m
▶️Answer/Explanation
Ans D
Question
A guitar string is plucked. Which statement describes the resulting waves?
A Longitudinal waves on the string cause longitudinal waves in the air.
B Longitudinal waves on the string cause transverse waves in the air.
C Transverse waves on the string cause longitudinal waves in the air.
D Transverse waves on the string cause transverse waves in the air.
▶️Answer/Explanation
Ans C