This page covers Agniveer Army GD Sound & Light with complete concept notes, 12 graded practice MCQs, key points and exam-specific tips. Free to study.
A sound wave travels at 340 m/s in air. If the frequency of the sound is 170 Hz, what is its wavelength?
Practice 3easy
Which of the following is a characteristic of light that proves it travels in straight lines?
Practice 4easy
The human ear can hear sounds in the frequency range of approximately:
Practice 5medium
The speed of light in a medium is 2 × 10⁸ m/s. If the speed of light in vacuum is 3 × 10⁸ m/s, what is the refractive index of the medium?
Practice 6medium
Which of the following phenomena demonstrates that light travels in straight lines?
Practice 7medium
A sound wave has a frequency of 500 Hz. If the speed of sound in air is 340 m/s, what is the wavelength of this sound wave?
Practice 8medium
When light passes from air into glass at an angle, it bends towards the normal. This phenomenon is called:
Practice 9medium
The audible range of sound frequencies for humans is approximately:
Practice 10hard
A sound wave travels through air at 340 m/s. If the frequency of the sound is 170 Hz, what is its wavelength?
Practice 11hard
Light travels from a denser medium (refractive index 1.5) to air (refractive index 1.0). At what angle of incidence will the angle of refraction be 90°?
Practice 12hard
When sound reflects off a rigid surface, the reflected wave undergoes a phase change of: