একটি পারমাণবিক চুল্লিতে, উচ্চ গতির একটি নিউট্রন `(~~10^(7)ms^(-1))` হতে হবে

A stone is dropped into a well of depth 80 m . Splash of sound is heard after 4.25 sec . If g=10ms^(-2) , velocity of sound in air is A) 300 ms^(-1) ; B) 360 ms^(-1) ; C) 320 ms^(-1) ; D) 400 ms^(-1) ;

The wavelength of an electron moving with velocity of 10^(7)ms^(-1) is

6. ^(*) The current in a metal wire of cross-sectional area 10^(-6)m^(2) is 1.6A .If the free electron density of the metal is 8times 10^(28)m^(-3) then the drift speed of electrons is (A) 1.25times10^(-3)ms^(-1) (B) 2times10^(-3)ms^(-1) (C) 1.25times10^(-4)ms^(-1) (D) 2times10^(-4)ms^(-1)

6. ^(*) The current in a metal wire of cross-sectional area 10^(-6)m^(2) is 1.6A .If the free electron density of the metal is 8times x^(2) x 10^(28)m^(-3) then the drift speed of electrons is (A) 1.25times10^(-3)ms^(-1) (B) 2times10^(-3)ms^(-1) (C) 1.25times10^(-4)ms^(-1) (D) 2times10^(-4)ms^(-1)

A proton (mass = 1.6times10^(-27)Kg enters into a magnetic field of induction 3T with a velocity of 10^(7)ms^(-1) at 30 to the field.The force on the proton?

Two molecules of a gas have speeds of 9xx10^(6) ms^(-1) and 1xx10^(6) ms^(-1) , respectively. What is the root mean square speed of these molecules.

Two molecules of gas have speeds of 9 xx 10^(6) ms^(-1) and 1 xx 10^(6) ms^(-1) respectively. What is the root mean square speed of these molecules?