Tritium (³₁H) the heavy isotope of hydrogen is sometimes used as a radioactive tracer for whole body scan. If it has a wavelength 4.5 x 10^-13 m, its energy in electron volt is _______. ( h = 6 x 10^-34 Js, 1eV = 1.6x 10^-19 J , c = 3x10⁸ ms^-1 )

The aorta of an adult average human has an area of 5 cm². When the normal volume flow rate of blood is about 5 liters per minute, the flow velocity of blood is

A certain single negatively changed ions (m= 6x10^-27 kg, q = 1.5x10^-19C is held stationary in an electric field between two horizontal parallel plates, the magnitude of the field intensity is _______.

A man with a defective eye cannot see thing which are more than 50cm away from him. The focal length of spectacle lens should use to see distant object clearly is

A uniform bar of length 2 m is observed to balance when supported at the centre of the bar. When the support is moved 0.2m away from the centre? It is found that a 5 kg mass hung o.4m from the new pivot point will again balance the bar. The mass of the bar is ______.

A plano-concave crown glass lens has a concave surface with radius of curvature of 40 cm, the focal length of the lens is

12 MHz ultrasonic wave is directed toward a blood vessel where red blood cells are moving at 20 ms^-1 toward the stationary source. If the speed of ultra sound is 1500ms^-1 , the apparent frequency on red blood cell is

A high way curve with a radius of curvature of 1000 ft is unbanked. If the mass of the car is 100 slug , what frictional force toward the center of the curve at 88 fts^-1 ?

The protons are injected with 3.2x10^-19N at a speed of 2x 10⁵ ms^-1 and a magnetic field is applied to make them move in a circular path ( r = 200m). The magnetic flux density of the field required for protons move in the circular path is _______.