Question
Stars in the sky appear to twinkle due to
–Solution
The movement of air (sometimes called turbulence) in the atmosphere of Earth causes a series of refractions which makes the starlight to get slightly bent as it travels from the distant star through the atmosphere down to us on the ground. This means that some of the light reaches us directly and some gets bent slightly away. To our eyes, this makes the star seem to twinkle.
A 5 V battery of negligible internal resistance is connected across a 190 V battery and a resistance of 37 Ω as shown in the figure. Find the value of...
The escape velocity from a planet is 11.2 km/s. What is the minimum kinetic energy per kg needed to escape?
1. 6.3 x 107 J/ Kg
<...Two bodies are in SHM having the same amplitude but different frequencies. The motion of the resultant is:
Who is credited with inventing the microphone?
Tungsten is used for the construction of filament in an electric bulb because of its
What is the product of the reaction?
CH₃COOH + CH₃OH → (H⁺, heat)
Which among the following nutrients is essential for the normal functioning of the thyroid gland?
The anther contains
The seed multiplication ratio of rapeseed, red gram, hybrid maize, sorghum and jute is:
Which of the following is correct regarding frequency?
I. Frequency is expressed in hertz
II. A frequency of 1 Hz is one oscillation per minute
