A train of length 400 m takes 15 seconds to cross a train of length 300 m travelling at 60 km per hour from the opposite direction along a parallel track. What is the speed of the longer train, in km per hour?
The correct answer is A
Which of the following equations correctly represents the momentum p of a photon of Energy E?
In half-wave rectifier, what is the output frequency if the input frequency is 40 Hz. What is the output frequency of a full-wave rectifier for the same...
In order to use the transistor as an amplifier, it has to operate in the____ region
A spherical black body with a radius of 8 cm radiates 450-watt power at 500 K. If the radius were halved and the temperature doubled, the power radiated...
Rain drops acquire spherical shape due to -
In the absence of ozone layer, which rays will enter into atmosphere?
In a concave mirror which of the following pair of position of object – size of the image is correct?
I. At infinity – point sized
The term ‘Isoneph' indicates the lines of equal –
The electric and magnetic fields of an electromagnetic wave are _____________
The ratio of the amplitudes of the electric field and magnetic field strengths has the same dimensions as that of: