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 )

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 ?

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 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 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

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 _______.

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