This is the most confusing question related to class 8 science chapter sound Q.will sound wave having frequency of 144Hz and 240Hz produce a musical sound?Why? Jsunil sir blog Visit , comment and subscribe www.Jsuniltutorial.in Correct answer is: Yes , sound wave having frequency of 144Hz and 240Hz produce a musical sound because musical notes is produced by a combination of frequencies which are in a simple ratio of whole number with each other . Class 09 Chapter sound Examples : Sound of frequencies of 261.62Hz,523.24hz and 784.86Hz produced one after another produce a musical sound as they are in ratio 1:2:3 Question related to Eureka plus science book In Indian classical music, the seven main musical notes are known as "Saptak Swaras." Each of these notes is associated with a specific frequency, and they form the basis of melodies and ragas. The frequencies can vary slightly depending on the tuning system and reference pitch used, but I'll provide you with approximate frequencies for these notes: 1. Sa (Shadja) - The tonic note: Approximate Frequency: Around 220Hz (in the middle octave) 2. Re (Rishabh) - The second note: Approximate Frequency: Around 246.94Hz 3. Ga (Gandhar) - The third note: Approximate Frequency: Around 293.66Hz 4. Ma (Madhyam) - The fourth note: Approximate Frequency: Around 329.63Hz 5. Pa (Pancham) - The fifth note: Approximate Frequency: Around 392.00Hz 6. Dha (Dhaivat) - The sixth note: Approximate Frequency: Around 440.00Hz 7. Ni (Nishad) - The seventh note: Approximate Frequency: Around 493.88Hz These frequencies are based on the equal temperament tuning system and are given for the reference pitch of A4 being 440Hz. Keep in mind that in different styles of Indian classical music and different tunings, these frequencies might vary slightly. These notes and their frequencies form the foundation of Indian classical music, and melodies are created by combining these notes in various patterns and sequences.
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The distance covered by the policeman in 12 sec s = ut + 1/2 at2 = 0 x12 + 0.5 x3 x 12x12 = 216m v = u + at = 0 + 12x3 = 36m/s The distance covered by the robber in 12 sec s = 20 x 12 = 240m Suppose he over takes in 12 + t sec, in which he travels = 216 + 36 * t r robbers will travel in the same time 20 * ( 12+t) m 216 + 36 t = 240 + 20 t t = 24 / 16 = 1.5 s Distance travelled by policeman in 12 + 1.5 = 13.5 s = 216 + 36 x 1.5 = 270 m Answer: The constant force that acts on the body along the radius towards the centre and perpendicular to the velocity of the body is known as centripetal force. Let us consider an object of mass m, moving along a circular path of radius r, with an angular velocity ω and linear velocity v. F = (mv2)/r Again, centripetal force, F = mrω2 [( since v = rω ) Examples 1. In the case of the stone tied to the end of a string and rotated in a circular path, the centripetal force is provided by the tension in the string. 2. When a car takes a turn on the road, the frictional force between the tyres and the road provides the centripetal force. 3. In the case of planets revolving round the sun or the moon revolves around the earth, the centripetal force is provided by the gravitational force of attraction between them. 4. For an electron revolving around the nucleus in a circular path, the electro static force of attraction between the electron and the nucleus provides the necessary centripetal force. The force, which is equal in magnitude but opposite in direction to the centripetal force is known as centrifugal force. In the first example (stone), not only is the stone acted upon by a force (centripetal force) along the string towards the centre, but the stone also exerts an equal and opposite force on the hand away from the centre along the string. Examples 1. While churning curd, butter goes to the side due to centrifugal force. |