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A gas hydrogen like atoms can absorb radiations of 68eV. Consequently, the atoms emit radiations of only three different wavelengths. All the wavelengths are equal or smaller than that of the absorbed photon. (a) Determine the initial state of the gas atoms. (b) Identify the gas atoms. (c) Find the minimum wavelength of the emitted radiation. (d) Find the ionization energy and the respective wavelength for the gas atoms.
25
Aug
A gas hydrogen like atoms can absorb radiations of 68eV. Consequently, the atoms emit radiations of only three different wavelengths. All the wavelengths are equal or smaller than that of the absorbed photon. (a) Determine the initial state of the gas atoms. (b) Identify the gas atoms. (c) Find the minimum wavelength of the emitted [...]
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A gas hydrogen like atoms can absorb radiations of 68eV. Consequently ,
A is ahead of B in phase by 66^@. If the observation be taken from point P ,
Among the two interfering monochromatic sources A and B ,
such that PB-PA=lambda//4. Then the phase difference between the waves from A and B reaching P is ,
For production of beats the two sources must have
25
Aug
For production of beats the two sources must have For production of beats the two sources must have August 25, 2020 Category: Chapter 16 - Waves , NEET Last 32 Years Solved 1988 - 2019 Physics and Chemistry Video Solutions , Physics ,
A star, which is emitting radiation at a wavelength of 5000 A0 , is approaching the earth with a velocity of 1.50×10^6m/s . The change in the wavelength of the radiation as received on the earth is
25
Aug
A star, which is emitting radiation at a wavelength of 5000 A0 , is approaching the earth with a velocity of 1.50×10^6m/s . The change in the wavelength of the radiation as received on the earth is A star is approaching the earth with a velocity of 1.50×10^6m/s . The change in the wavelength of [...]
P is small angled prism of angle 3 made of a material of refractive index 1.5. A ray of light is incident normally to the mirror as shown in figure. M is a plane mirror. The angle of deviation for the ray reflected from the mirror M with respect to the incident ray is :
25
Aug
P is small angled prism of angle 3 made of a material of refractive index 1.5. A ray of light is incident normally to the mirror as shown in figure. M is a plane mirror. The angle of deviation for the ray reflected from the mirror M with respect to the incident ray is : [...]
A scale is adjusted to zero . Particles fall from a height h = 250 m before colliding with the balance pan of the scale . The collisions are elastic . If each particle has a mass of m = 100 mg and collisions occur at the rate n = 1000 particles per second , what is the scale reading in kg ?
25
Aug
A scale is adjusted to zero . Particles fall from a height h = 250 m before colliding with the balance pan of the scale . The collisions are elastic . If each particle has a mass of m = 100 mg and collisions occur at the rate n = 1000 particles per second , [...]
A vehicle, with a horn of frequency n is moving with a velocity of 30 m/s in a direction perpendicular to the straight line joining the observer and the vehicle. The observer perceives the sound to have a frequency (n+n1). If the velocity of sound in air is 300 m/s, then
25
Aug
A vehicle, with a horn of frequency n is moving with a velocity of 30 m/s in a direction perpendicular to the straight line joining the observer and the vehicle. The observer perceives the sound to have a frequency (n+n1). If the velocity of sound in air is 300 m/s, then A vehicle approaches towards [...]
Among the two interfering monochromatic sources A and B, A is ahead of B in phase by 66. If the observation be taken from point P, such that PB – PA = lambda/4. Then the phase difference between the waves from A and B reaching P is
25
Aug
Among the two interfering monochromatic sources A and B, A is ahead of B in phase by 66. If the observation be taken from point P, such that PB – PA = lambda/4. Then the phase difference between the waves from A and B reaching P is A is ahead of B in phase by [...]
Two waves of wavelength 50 cm and 51 cm produce 12 beat/s. The speed of sound is
25
Aug
Two waves of wavelength 50 cm and 51 cm produce 12 beat/s. The speed of sound is Two waves of wavelength 50 cm and 51 cm produce 12 beat/s. The speed of sound is August 25, 2020 Category: Chapter 16 - Waves , NEET Last 32 Years Solved 1988 - 2019 Physics and Chemistry Video [...]
A railroad flatcar of mass M can roll without friction along a straight horizontal track. Initially, a man of mass ‘m’ is standing on the car, which is at rest. What is the velocity of the car if man runs to the left so that his speed relative to the car is vrel.
25
Aug
A railroad flatcar of mass M can roll without friction along a straight horizontal track. Initially, a man of mass ‘m’ is standing on the car, which is at rest. What is the velocity of the car if man runs to the left so that his speed relative to the car is vrel. a man [...]
The ratio of the intensity at the centre of a bright fringe to the intensity at a point one-quarter of the distance between two fringes from the centre is :
25
Aug
The ratio of the intensity at the centre of a bright fringe to the intensity at a point one-quarter of the distance between two fringes from the centre is : The ratio of the intensity at the centre of a bright fringe to the intensity at a point one-quarter of the distance between two fringes [...]