Waves Basics — Set 1
Physics · तरंगों की मूल बातें · Questions 1–10 of 60
When a wave enters a new medium, which quantity generally remains unchanged?
Correct Answer: C. Frequency
Frequency stays the same because it is set by the source of the wave. The wave speed and wavelength can change in a new medium. The relation v = fλ connects these quantities.
A wave in which particles of the medium vibrate perpendicular to the direction of propagation is called?
Correct Answer: D. Transverse wave
It is a transverse wave because vibration is perpendicular to the wave’s travel direction. In longitudinal waves, vibration is parallel to propagation. Light is an example of a transverse electromagnetic wave.
The time taken to complete one full oscillation is called?
Correct Answer: C. Time period
Time period is correct because it measures one complete cycle duration. Frequency tells how many cycles occur per second. They are related by T = 1/f.
In a longitudinal wave, the distance between two successive compressions is?
Correct Answer: D. Wavelength
Wavelength is correct because it is the repeating spatial length of the wave. In a longitudinal wave, compression to compression spans one wavelength. The same idea applies from rarefaction to rarefaction.
Sound waves in air are generally?
Correct Answer: C. Longitudinal mechanical waves
Sound in air is longitudinal and mechanical, so option C is correct. It needs a material medium to travel through. The particles oscillate parallel to the direction of propagation.
Which of the following is NOT a mechanical wave?
Correct Answer: C. Light wave
Light is correct because it is an electromagnetic wave, not a mechanical wave. Mechanical waves require a material medium to propagate. Electromagnetic waves can travel through vacuum.
Which formula correctly relates wave speed (v), frequency (f), and wavelength (λ)?
Correct Answer: A. v = fλ
v = fλ is correct because each cycle advances one wavelength in space. Multiplying cycles per second by meters per cycle gives meters per second. This relation applies to many basic wave types.
If the frequency of a wave doubles while its speed remains constant, its wavelength becomes?
Correct Answer: D. Half
It becomes half because v = fλ and v is constant. If f doubles, λ must decrease by a factor of two. Wavelength and frequency are inversely proportional at fixed speed.
Pitch of a sound mainly depends on?
Correct Answer: D. Frequency
Frequency is correct because higher frequency produces higher pitch. Amplitude mainly affects loudness, not pitch. Human hearing detects pitch changes as frequency changes.
Loudness of a sound is mainly related to?
Correct Answer: D. Intensity (linked to amplitude)
Intensity is correct because louder sounds carry more energy per unit area. Intensity increases with the square of amplitude in many cases. Loudness is a perception related to intensity level.