Physics
(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.
Related Questions
(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?
Arrange α, β and γ-rays in ascending order with respect to their
(a) penetrating power
(b) ionising power
(c) biological effect
Shrey's room have two electric bulbs, these bulbs are connected in series and power supplied by 220 V.
(a) Calculate the total resistance of the circuit.
(b) Calculate the current in the circuit.
(c) Calculate the voltage drop across each bulb.
Write reactions of a nucleus 11X23 when it loses
(a) one proton
(b) one β particle
(c) one α particle