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Which of the following months are the coldest months in the northern part of India?
The correct answer is: (c) December-January Explanation: December and January are the coldest months in the northern part of India due to the winter season. The Himalayas block the cold Siberian winds, but temperatures still drop significantly, especially in Punjab, Haryana, Himachal Pradesh, UttaraRead more
The correct answer is: (c) December-January
Explanation: December and January are the coldest months in the northern part of India due to the winter season. The Himalayas block the cold Siberian winds, but temperatures still drop significantly, especially in Punjab, Haryana, Himachal Pradesh, Uttarakhand, Rajasthan, and Uttar Pradesh.
Cold waves, fog, and frost are common during this period, and hill stations like Shimla, Manali, and Srinagar experience sub-zero temperatures and snowfall.
This question related to Chapter 4 Social Science Class 9th NCERT. From the Chapter 4 Climate. Give answer according to your understanding.
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If the velocity of sound in air is 350 m s⁻¹, a person singing a note of 250 cycles per second is producing sound waves with a wavelength of
(b) Velocity of sound v = 350 m s-¹, frequency of note v = 250 cps = 250 Hz ∴ Wavelength of wave λ = υ /V = 350/250 m = 1.4 m https://www.tiwariacademy.com/ncert-solutions/class-9/science/chapter-11/
(b) Velocity of sound v = 350 m s-¹, frequency of note v = 250 cps = 250 Hz
∴ Wavelength of wave λ = υ /V = 350/250 m = 1.4 m
https://www.tiwariacademy.com/ncert-solutions/class-9/science/chapter-11/
See lessIf the tension in a stretched string is increased, the speed of the wave
In a stretched string, the speed of the wave is given by: v = √(T/μ). Where: - v is the wave speed, - T is the tension in the string, - μ is the linear mass density (with mass per unit length). From the equation, it can be seen that the wave speed v is directly proportional to the square root of tenRead more
In a stretched string, the speed of the wave is given by:
v = √(T/μ).
Where:
– v is the wave speed,
– T is the tension in the string,
– μ is the linear mass density (with mass per unit length).
From the equation, it can be seen that the wave speed v is directly proportional to the square root of tension T. With the increase in tension, the numerator goes up and, hence, the speed of the wave increases.
Thus, increasing the tension in the string results in an increase in wave speed.
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What can be the minimum temperature at Drass in winters?
The correct answer is: (d) -45°C Explanation: Drass, in the Kargil district of Ladakh, is one of the coldest inhabited places in the world. During peak winter (December to February), the temperature can drop as low as -45°C or even lower. The region experiences heavy snowfall, icy winds, and extremeRead more
The correct answer is: (d) -45°C
Explanation: Drass, in the Kargil district of Ladakh, is one of the coldest inhabited places in the world.
During peak winter (December to February), the temperature can drop as low as -45°C or even lower.
The region experiences heavy snowfall, icy winds, and extreme cold conditions, making it almost uninhabitable during winters. Drass is often called the “Gateway to Ladakh” and is famous for its bone-chilling winters. This question related to Chapter 4 Social Science Class 9th NCERT. From the Chapter 4 Climate. Give answer according to your understanding.
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The Doppler effect causes a change in
In simple terms, it means the change in frequency and wavelength of a wave because of the relative motion of the source with respect to the observer. The frequency observed f' can be expressed by this equation: f' = f(v ± vₒ)/(v ∓ vₛ) where: - f' is the observed frequency, - f is the source frequencRead more
In simple terms, it means the change in frequency and wavelength of a wave because of the relative motion of the source with respect to the observer. The frequency observed f’ can be expressed by this equation:
f’ = f(v ± vₒ)/(v ∓ vₛ)
where:
– f’ is the observed frequency,
– f is the source frequency,
– v is a constant speed of propagation of the wave,
– vₒ is the velocity of the observer,
– vₛ is the velocity of the source.
Once again, though, since wave speed remains constant in a given medium, firmly speaking there must also be a change in wavelength λ’ for a change in frequency f’ to occur regarding the wave equation:
v = fλ
So the Doppler effect is that the frequency and wave have been destroyed, with speed being uniform.
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