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The equation of a traveling wave is y = A sin(kx – ωt). The term k represents
In the wave equation y = A sin(kx – ωt): - k is the wave number, which describes the spatial frequency of the wave. In technical terms, it is defined as k = 2π/λ, where λ is the wavelength. - It tells how many wave cycles are accommodated in a unit distance. Therefore, k decides the waves' propagatiRead more
In the wave equation y = A sin(kx – ωt):
– k is the wave number, which describes the spatial frequency of the wave. In technical terms, it is defined as k = 2π/λ, where λ is the wavelength.
– It tells how many wave cycles are accommodated in a unit distance.
Therefore, k decides the waves’ propagation in space.
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Find out the correct sentence: (i) Cross between plants of two species is called intervarietal hybridisation. (ii) Cross between two varieties is called interspecific hybridisation. (iii) Hybridisation means crossing between genetically dissimilar plants. (iv) Introducing genes of desired character into a plant gives genetically modified crop.
(c) Cross between two species is interspecific cross and between varieties is inter-varietal cross. https://www.tiwariacademy.com/ncert-solutions/class-9/science/chapter-12/
(c) Cross between two species is interspecific cross and between varieties is inter-varietal cross.
https://www.tiwariacademy.com/ncert-solutions/class-9/science/chapter-12/
See lessThe speed of sound is maximum in
Speed of sound depends on the density and elasticity of the medium. It can be defined using the formula: v = √(B/ρ) Where, - B is the bulk modulus, which is nothing but elasticity of the medium. - ρ is the density of the medium. Since the bulk modulus in solids is way more than that of gases and liqRead more
Speed of sound depends on the density and elasticity of the medium. It can be defined using the formula:
v = √(B/ρ)
Where,
– B is the bulk modulus, which is nothing but elasticity of the medium.
– ρ is the density of the medium.
Since the bulk modulus in solids is way more than that of gases and liquids, sound will travel fastest in a solid. Out of the above options, steel has the highest elasticity: so, the speed of sound is maximum in steel.
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Which one of the following is not a major activity for improving crop yield?
(d) Transportation of crops is not related to improvement of crop yield. https://www.tiwariacademy.com/ncert-solutions/class-9/science/chapter-12/
(d) Transportation of crops is not related to improvement of crop yield.
https://www.tiwariacademy.com/ncert-solutions/class-9/science/chapter-12/
See lessThe time period (T) of a wave is related to its frequency (f) as
The right answer is T = 1/f. The time period (T) of a wave is defined as the amount of time it takes for one complete cycle of the wave. It is related to frequency (f) by the formula: T = 1/f where: - T is time period (in seconds), - f is frequency (in hertz, Hz). This is the inverse relation; it isRead more
The right answer is T = 1/f.
The time period (T) of a wave is defined as the amount of time it takes for one complete cycle of the wave. It is related to frequency (f) by the formula:
T = 1/f
where:
– T is time period (in seconds),
– f is frequency (in hertz, Hz).
This is the inverse relation; it is such that as the frequency is higher, the time period will be less, and vice versa.
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