# A numerical problem from Beats

Nithya asks: "A source of sound frequency 256Hz is moving rapidly towards a wall with a velocity of 5m/s. How many beats per second will be heard if sound travels at a speed of 330m/s?" a wire of length 140 cm and mass 0.52×10- kg is stretched by means of a load of 16 kg. … Continue reading A numerical problem from Beats

# SET OF MUST PRACTICE QUESTIONS FOR CBSE PHYSICS CLASS XII (AISSCE PHYSICS 2011)

Hello Dear Students, If you were searching for a set of questions which you cannot afford to leave while preparing for AISSCE 2011 Physics Exam, Here it is. Please practice them carefully. If you have any doubt in answering any of these questions, please feel free to ask at www.askphysics.com The content is being updated … Continue reading SET OF MUST PRACTICE QUESTIONS FOR CBSE PHYSICS CLASS XII (AISSCE PHYSICS 2011)

# Communication Systems : Revision Test

One mark questions What is the meant by the term attenuation ? Why ground wave transmission is restricted to 1500 kHz? Define critical frequency in sky wave propagation. What type of modulation is required in TV transmission? Why AM radio reception is affected by electrical disturbances while FM radio reception is not? What should be … Continue reading Communication Systems : Revision Test

# Wave travelling from one medium to another

Iqbal Lucky asked "when a wave enters from air to water, its wavelength changes but frequency remains unchanged. why" Answer Velocity of a wave = frequency x time period V = ν λ When a wave travels from one medium to another, its velocity changes and so also is its wavelength, but frequency; which is … Continue reading Wave travelling from one medium to another

# Oscillations and Waves :: Question Bank

Oscillations and Waves is considered as the most difficult chapters by most of the students. In many schools, these chapters are not properly discussed and taught due to the lack of time they face during the last term. Further the lack of proper explanations for the different concepts and steps in the text book also add to … Continue reading Oscillations and Waves :: Question Bank