Class 11 Physics
Waves
Question 1.
Define longitudinal and transverse waves.
Question 2.
How does the frequency of a wave is related to its angular frequency?
Question 3.
A SONAR system fixed in a submarine operates at a frequency 50.0 kHz. An enemy submarine moves towards the SONAR with a speed of 420 km-h–1. What is the frequency of sound reflected by the submarine? Take the speed of sound in water to be 1450 m-s–1.
Question 4.
Give the displacement function in a sinusoidal wave propagating in positive x-direction.
Question 5.
Give the formula for speed of a progressive wave.
Question 6.
How do you define the period of oscillation of a wave?
Question 7.
A bat emits ultrasonic sound of frequency 1500 kHz in air. If the sound meets a water surface, what is the wavelength of (a) the reflected sound, (b) the transmitted sound? Speed of sound in air is 340 m-s–1 and in water 1486 m-s–1.
Question 8.
Explain Doppler effect.
Question 9.
Give units and dimensions for the following quantities:
(a) Wavelength
(b) Wave speed
(c) Beat frequency
Question 10.
How can u calculate beat frequency?
Question 11.
What is the principle of superposition of waves?
Question 12.
A string of mass 3.00 kg is under a tension of 500 N. The length of the stretched string is 30.0 m. If the transverse jerk is struck at one end of the string, how long does the disturbance take to reach the other end?
Question 13.
Define nodes and antinodes. Also, define fundamental and second harmonic mode of a wave.
Question 14.
A train, standing at the outer signal of a railway station blows a whistle of frequency 300 Hz in still air. (i) What is the frequency of the whistle for a platform observer when the train (a) approaches the platform with a speed of 15 m-s–1, (b) recedes from the platform with a speed of 15 m-s–1? (ii) What is the speed of sound in each case? The speed of sound in still air can be taken as 340 m-s–1.
Question 15.
What are sound waves? Give formula for the speed of sound in fluids.
Question 16.
A rocket is moving at a speed of 250 m-s–1 towards a stationary target. While moving, it emits a wave of frequency 2000 Hz. Some of the sound reaching the target gets reflected back to the rocket as an echo. Calculate (1) the frequency of the sound as detected by the target and (2) the frequency of the echo as detected by the rocket.
Question 17.
Two sitar strings A and B playing the note ‘Ga’ are slightly out of tune and produce beats of frequency 3 Hz. The tension of the string B is slightly increased and the beat frequency is found to decrease to 2 Hz. What is the original frequency of B if the frequency of A is 415 Hz?
Question 18.
A steel wire 0.50 m long has a mass of 8.0 ×10–3 kg. If the wire is under a tension of 80 N, what is the speed of transverse waves on the wire?
Question 19.
A wire stretched between two rigid supports vibrates in its fundamental mode with a frequency of 50 Hz. The mass of the wire is 4.0 × 10–2 kg and its linear mass density is 5.5 × 10–2 k- m–1. What is (a) the speed of a transverse wave on the string, and (b) the tension in the string?
Question 20.
A string of mass 5.00 kg is under a tension of 350 N. The length of the stretched string is 20.0 m. If the transverse jerk is struck at one end of the string, how long does the disturbance take to reach the other end?
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In summary, problem-solving after learning a theoretical concept on CBSE Waves Class 11 Physics is an essential part of the learning process. It enhances your understanding, critical thinking abilities, and retention of knowledge. Moreover, it equips you with valuable skills that are applicable in academic, personal, and professional contexts.
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Practicing questions plays a pivotal role in achieving excellence in exams. Just as the adage goes, "Practice makes perfect," dedicating time to solve a diverse range of exam-related questions yields manifold benefits. Firstly, practicing questions allows students to familiarize themselves with the exam format and types of problems they might encounter. This familiarity instills confidence, reducing anxiety and improving performance on the actual exam day. Secondly, continuous practice sharpens problem-solving skills and enhances critical thinking, enabling students to approach complex problems with clarity and efficiency. Thirdly, it aids in identifying weak areas, allowing students to focus their efforts on improving specific topics. Moreover, practice aids in memory retention, as active engagement with the material reinforces learning. Regular practice also hones time management skills, ensuring that students can allocate appropriate time to each question during the exam. Overall, practicing questions not only boosts exam performance but also instills a deeper understanding of the subject matter, fostering a holistic and effective learning experience.
All About Daily Practice Problems on Class 11 Physics Waves NCERT Chapter 14
Our Daily Practice Problems (DPPs) offer a diverse range of question types, including Multiple Choice Questions (MCQs) as well as short and long answer types. These questions are categorized into Easy, Moderate, and Difficult levels, allowing students to gradually progress and challenge themselves accordingly. Additionally, comprehensive solutions are provided for each question, available for download in PDF format - Download pdf solutions as well as Download pdf Questions. This approach fosters a holistic learning experience, catering to different learning styles, promoting self-assessment, and improving problem-solving skills. With our well-structured DPPs, students can excel in exams while gaining a deeper understanding of the subject matter. Hope you found the content on Class 11 Physics Waves NCERT Chapter 14 useful.
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