JEE Mains Physics 2002-2019 Solved Video Solutions
A beam of electromagnetic radiation of intensity 6.4 × 10^–5 W/cm^2 is comprised of wavelength, λ = 310 nm. It falls normally on a metal (work function φ = 2eV) of surface area of 1 cm^2. If one in 10^3 photons ejects an electron, total number of electrons ejected in 1 s is 10^x. (hc=1240 eVnm, 1eV=1.6×10^–19 J), then x is ___.
19
Sep
A beam of electromagnetic radiation of intensity 6.4 × 10^–5 W/cm^2 is comprised of wavelength, λ = 310 nm. It falls normally on a metal (work function φ = 2eV) of surface area of 1 cm^2. If one in 10^3 photons ejects an electron, total number of electrons ejected in 1 s is 10^x. (hc=1240 [...]
Tags:
1eV=1.6×10^–19 J) ,
A beam of electromagnetic radiation of intensity 6.4 × 10^–5 W/cm^2 is comprised of wavelength ,
then x is ___. ,
total number of electrons ejected in 1 s is 10^x. (hc=1240 eVnm ,
λ = 310 nm. It falls normally on a metal (work function φ = 2eV) of surface area of 1 cm^2. If one in 10^3 photons ejects an electron ,
A loop ABCDEFA of straight edges has six corner points A(0,0,0), B(5,0,0), C(5,5,0), D(0, 5, 0), E(0, 5, 5) and F(0, 0, 5). The magnetic field in this region is vector B = (3i + 4k)T. The quantity of flux through the loop ABCDEFA (in Wb) is ______ .
19
Sep
A loop ABCDEFA of straight edges has six corner points A(0,0,0), B(5,0,0), C(5,5,0), D(0, 5, 0), E(0, 5, 5) and F(0, 0, 5). The magnetic field in this region is vector B = (3i + 4k)T. The quantity of flux through the loop ABCDEFA (in Wb) is ______ . 0 ) 5 5) and F(0 [...]
The radius of gyration of a uniform rod of length l, about an axis passing through a point l/4 away from the centre of the rod, and perpendicular to it, is :
19
Sep
The radius of gyration of a uniform rod of length l, about an axis passing through a point l/4 away from the centre of the rod, and perpendicular to it, is : about an axis passing through a point l/4 away from the centre of the rod and perpendicular to it is The radius of [...]
A Carnot engine operates between two reservoirs of temperatures 900 K and 300 K. The engine performs 1200 J of work per cycle. The heat energy (in J) delivered by the engine to the low temperature reservoir, in a cycle, is____
19
Sep
A Carnot engine operates between two reservoirs of temperatures 900 K and 300 K. The engine performs 1200 J of work per cycle. The heat energy (in J) delivered by the engine to the low temperature reservoir, in a cycle, is____ The correct match between the entries in table are : September 19, 2021 Category: [...]
Three point particles of masses 1.0 kg, 1.5 kg and 2.5 kg are placed at three corners of a right angle triangle of sides 4.0 cm, 3.0 cm and 5.0 cm as shown in the figure. The center of mass of the system is at a point :
19
Sep
Three point particles of masses 1.0 kg, 1.5 kg and 2.5 kg are placed at three corners of a right angle triangle of sides 4.0 cm, 3.0 cm and 5.0 cm as shown in the figure. The center of mass of the system is at a point : 1.5 kg and 2.5 kg are placed [...]
A long solenoid of radius R carries a time dependent current I = I0t(1 – t). A ring of radius 2R is placed coaxially near its centre. During the time interval 0 ≤ t ≤ 1, the induced current IR and the induced emf VR in the ring change as:
19
Sep
A long solenoid of radius R carries a time dependent current I = I0t(1 – t). A ring of radius 2R is placed coaxially near its centre. During the time interval 0 ≤ t ≤ 1, the induced current IR and the induced emf VR in the ring change as: A long solenoid of radius [...]
A polarizer – analyser set is adjusted such that the intensity of light coming out of the analyser is just 10% of the original intensity. Assuming that the polarizer – analyser set does not absorb any light, the angle by which the analyser need to be rotated further to reduce the output intensity to be zero, is :
19
Sep
A polarizer – analyser set is adjusted such that the intensity of light coming out of the analyser is just 10% of the original intensity. Assuming that the polarizer – analyser set does not absorb any light, the angle by which the analyser need to be rotated further to reduce the output intensity to be [...]
A 60 HP electric motor lifts an elevator having a maximum total load capacity of 2000 kg. If the frictional force on the elevator is 4000 N, the speed of the elevator at full load is close to: (1 HP = 746 W, g = 10 ms^-2)
19
Sep
A 60 HP electric motor lifts an elevator having a maximum total load capacity of 2000 kg. If the frictional force on the elevator is 4000 N, the speed of the elevator at full load is close to: (1 HP = 746 W, g = 10 ms^-2) A 60 HP electric motor lifts an elevator [...]
A litre of dry air at STP expands adiabatically to a volume of 3 litres. If γ = 1.40, the work done by air is : (3^1.4 = 4.6555) [Take air to be an ideal gas]
19
Sep
A litre of dry air at STP expands adiabatically to a volume of 3 litres. If γ = 1.40, the work done by air is : (3^1.4 = 4.6555) [Take air to be an ideal gas] A litre of dry air at STP expands adiabatically to a volume of 3 litres. If γ = 1.40 [...]
If we need a magnification of 375 from a compound microscope of tube length 150 mm and an objective of focal length 5 mm, the focal length of the eye-piece, should be close to :
19
Sep
If we need a magnification of 375 from a compound microscope of tube length 150 mm and an objective of focal length 5 mm, the focal length of the eye-piece, should be close to : If we need a magnification of 375 from a compound microscope of tube length 150 mm and an objective of [...]