Physics
(a) A wave has a frequency of 800 MHz and a wave length of 30 cm. Calculate velocity.
(b) A radio can tune in to any station in 17.5 MHz to 13.5 MHz band, what is the corresponding wavelength band?
Related Questions
A coolie of mass 55 kg move a load of 25 kg on his head upto 50 stairs, each of height 20 cm in 50 s. If g is 10 m/s2, then find
(a) gravitational force acting on coolie,
(b) work done by him
(c) his power in watt
(d) the gravitational force is increased by two times, then calculate the power.
(a) What is a simple machine? State the principle of an ideal machine.
(b) A block and tackle pulley system has a velocity ratio 3. Draw a labelled diagram of this system. In your diagram, indicate clearly the points of application and the directions of the load and effort.
Arrange α, β and γ-rays in ascending order with respect to their
(a) penetrating power
(b) ionising power
(c) biological effect
(a) A man standing between two cliffs produces a sound and hears two successive echoes at intervals of 2 s and 5 s respectively. Calculate the distance between the two cliffs. The speed of sounding in the air is 330 ms-1.
(b) Explain, why strings of different thicknesses are provided on a stringed instrument.