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CBSE 11th Economics PART-A - Presentation of Data - New Sample Question Papers Study Material - QB365 Set A
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Published on: 26/05/2021
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Download CBSE Class 11th Standard CBSE Physics question papers, sample papers, important questions, and previous year solved papers in PDF format. Get free study materials, NCERT solutions, and exam preparation resources for Class 11th Standard CBSE Physics
Questions + Answers key
Take MCQ Physics Test1.
Sound waves of wavelength \(\lambda \) travelling in a medium with a speed of vm/s enter into another medium where its speed is 2vm/s.Wavelength of sound waves in the second medium is
2.
The displacement of an elastic wave is given by the function y = 3sin \(\omega \)t + 4cos\(\omega \)t Where, y is in cm and t is in second.Calculate the resultant amplitude.
3.
How speed of sound waves in air varies with humidity?
4.
What is the nature of water waves produced by a motorboat sailing in water ?
5.
What is the quantity transmitted with propagation of longitudinal waves through a medium?
1.
Frequency in the first medium, v =v/λ
Frequency will remain same in the second medium, as the source.
⇒v, =v ⇒ 2v/λ′ = v/λ ⇒ λ′ = 2λ
2.
The resultant amplitude will be
y=\(\sqrt{y_2^1+y_2^2}=\sqrt{9+16}=\sqrt{25}=\)5cm
3.
Speed of sound waves in air increases with increases with increase in humidity. This is because presence of moisture decreases the density of air.
4.
Water waves produced by a motorboat sailing in water are both longitudinal and transverse.
5.
Propagation of longitudinal waves through a medium leads to transmission of energy through the medium.
11th Standard CBSE Syllabus & Materials
11th Standard CBSE
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