Question

2. Calculate the area of an equilateral triangle whose hieght is 20 cm
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Answer 1

Answer:

A gas at 298 K is shifted from a vessel of 250 cm3250 cm3 capacity to that of 1L capacity. The pressure of the gas willWhich of the following relations for expressing volume of a sample is not correctAccording to Charles’s law1°C1°C  rise in temperature is equal to a rise ofOne atmosphere is numerically equal to approximatelyIf the refracting angle of a prism is 60°60°  and minimum deviation30°30° , the angle of incidence will beA beam of white light is incident on a hollow glass prism. Then the light emerging from the prism gives from 0° and 90°

beamThe critical angle for water is 48.2°48.2° . Then its refractive index isWhen a light ray suffers reflection, at the interface between air and glass, the change of phase in the reflected wave is equal toWhen a light wave travels from denser to rarer medium, its

P) velocity decreases R) wavelength increases Q) frequency remains unchanged

Duration of day time is greater than night time due toIf n(μ)=100, n(A)=50, n(B)=20 and n(A∩B)=10  then  n[(A∪B)c]=