(b) Speed of sound in air v = 330 m s⁻¹ Time gap between lightening and thunder clap t = 5.5 s ∴ Distance of flash s = vt = 330 x 5.5 = 1815 m https://www.tiwariacademy.com/ncert-solutions/class-9/science/chapter-11/
(b) Speed of sound in air v = 330 m s⁻¹
Time gap between lightening and thunder clap t = 5.5 s
∴ Distance of flash s = vt = 330 x 5.5 = 1815 m
(a) Sound will be louder but pitch will not be different. When struck harder, amplitude of vibrations will be more and consequently a louder sound is produced. https://www.tiwariacademy.com/ncert-solutions/class-9/science/chapter-11/
(a) Sound will be louder but pitch will not be different. When struck harder, amplitude of vibrations will be more and consequently a louder sound is produced.
(c) The only wrong statement is, "The object always goes away from the earth". There is no connection between an accelerated motion and going away from the earth. https://www.tiwariacademy.com/ncert-solutions/class-9/science/chapter-8/
(c) The only wrong statement is, “The object always goes away from the earth”. There is no connection between an accelerated motion and going away from the earth.
A thunder clap is heard 5.5 s later than the lightning flash. The distance of the flash is: Speed of sound in air is 330 m s¯¹]
(b) Speed of sound in air v = 330 m s⁻¹ Time gap between lightening and thunder clap t = 5.5 s ∴ Distance of flash s = vt = 330 x 5.5 = 1815 m https://www.tiwariacademy.com/ncert-solutions/class-9/science/chapter-11/
(b) Speed of sound in air v = 330 m s⁻¹
Time gap between lightening and thunder clap t = 5.5 s
∴ Distance of flash s = vt = 330 x 5.5 = 1815 m
https://www.tiwariacademy.com/ncert-solutions/class-9/science/chapter-11/
See lessA key of a mechanical piano is struck gently and then struck again but much harder this time. In the second case
(a) Sound will be louder but pitch will not be different. When struck harder, amplitude of vibrations will be more and consequently a louder sound is produced. https://www.tiwariacademy.com/ncert-solutions/class-9/science/chapter-11/
(a) Sound will be louder but pitch will not be different. When struck harder, amplitude of vibrations will be more and consequently a louder sound is produced.
https://www.tiwariacademy.com/ncert-solutions/class-9/science/chapter-11/
See lessWhich among the following is/are necessary to solve the food problem of the country?
(d) All the statements are correct. https://www.tiwariacademy.com/ncert-solutions/class-9/science/chapter-12/
(d) All the statements are correct.
https://www.tiwariacademy.com/ncert-solutions/class-9/science/chapter-12/
See lessWhich of the following nutrient is not available in fertilisers?
(b) Fertilisers only contain NPK (Nitrogen, Phosphorus and Potassium). https://www.tiwariacademy.com/ncert-solutions/class-9/science/chapter-12/
(b) Fertilisers only contain NPK (Nitrogen, Phosphorus and Potassium).
https://www.tiwariacademy.com/ncert-solutions/class-9/science/chapter-12/
See lessWhich of the following statement is not correct for an object moving along a straight path in an accelerated motion?
(c) The only wrong statement is, "The object always goes away from the earth". There is no connection between an accelerated motion and going away from the earth. https://www.tiwariacademy.com/ncert-solutions/class-9/science/chapter-8/
(c) The only wrong statement is, “The object always goes away from the earth”. There is no connection between an accelerated motion and going away from the earth.
https://www.tiwariacademy.com/ncert-solutions/class-9/science/chapter-8/
See less