Physics Class 11&12 questions

The mean intensity of radiation on the surface of the Sun is about 10⁸ W/m2. The root mean square value of the corresponding magnetic field is closest to

A man can swim with a speed of 4Km/h in still water. How long does he take to cross a river 1 km wide If the river flows steadily 3Km/h and he makes his strokes normal to the river current. How far down the river does he go when he reaches the other bank?

An ice-berg of density 900 kg/m³ is floating in water of density1000 kg/m³. The percentage of volume of ice-berg outside the water is__________.

A uniform electric field E exists between the plates of a charged condenser. A charged particle enters the space between the plates and perpendicular to E. The path of the particle between the plates is a

The density of a material in SI units is 128 kg m^-3. In certain units in which the unit of length is 25 cm and the unit of mass is 50 g, the numerical value of density of the material is

1 HP (horse power) is equals to

1 kilowatt hour is equals to____________

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