#1
Which type of wave does not require a medium to propagate?
Electromagnetic wave
ExplanationIt can travel through vacuum due to electric and magnetic fields oscillating perpendicular to each other.
#2
What is the speed of sound in air at room temperature?
343 m/s
ExplanationThis is the typical speed of sound in air at 20°C (68°F).
#3
What is the SI unit of frequency?
Hertz
ExplanationOne Hertz (Hz) equals one cycle per second.
#4
Which type of wave oscillates perpendicular to the direction of propagation?
Transverse wave
ExplanationParticles in this wave move perpendicular to the direction of the wave.
#5
Which property of a wave determines its pitch?
Frequency
ExplanationHigher frequency waves have higher pitch, perceived as 'high' sounds.
#6
What is the phenomenon called when two waves superpose to form a wave with larger amplitude?
Interference
ExplanationThis occurs when waves combine, either constructively (adding amplitudes) or destructively (canceling out).
#7
What happens to the wavelength of a wave when its frequency increases?
Remains constant
ExplanationWavelength and frequency are inversely proportional; if one increases, the other decreases, but their product (speed) remains constant.
#8
Which phenomenon occurs when a wave changes direction as it passes from one medium to another?
Refraction
ExplanationIt happens due to the change in speed when transitioning from one medium to another, causing bending.
#9
Which law describes the relationship between the angle of incidence and the angle of reflection?
Law of Reflection
ExplanationIt states that the angle of incidence equals the angle of reflection.
#10
In the equation v = fλ, what does 'v' represent?
Speed of the wave
ExplanationIt represents how fast the wave is propagating through the medium.
#11
Which property of a wave determines its loudness?
Amplitude
ExplanationGreater amplitude corresponds to louder sounds.
#12
Which equation represents the relationship between frequency, wavelength, and speed of a wave?
v = fλ
ExplanationThis equation states that the speed of a wave equals its frequency multiplied by its wavelength.