Assume that you are travelling at a speed of 90 km/h in a small car with a mass of 1050 kg. If the uncertainty in the velocity of the car is 1% ( = 0.9 km/h), what is the uncertainty (in meters) in the position of the car ?
For a certain particle , it is found that uncertainty in velocity is reciprocal of uncertainty in position .This implies that :
mass of particle > unity
mass of particle = unity
mass of particle h
mass of particle h / 4
Which of the following sets of quantum numbers is not possible ?
n = 4 , l =1 , m = 0 , s =
n = 4 , l = 3 , m = - 3 , s =
n = 4 , l = 1 , m = + 2 , s =
n = 4 , l = 0 , m = 0 , s =
What is the frequency of a X-ray photon whose momentum is 1.1 x 10-23 kg-ms-2 ?
5 x 1016 Hz
0.5 x 1027 Hz
0.5 x 1018 Hz
5 x 1018 Hz
For an electron , if the uncertainty in velocity is v , the uncertainty in its position (x) is given by :
A metal surface is exposed to solar radiations :
the emitted electrons have energy less than a maximum value of energy depending upon frequency of incident radiations
the emitted electrons have energy less than maximum value of energy depending upon intensity of incident radiations
the emitted electrons have zero energy
the emitted electrons have energy equal to energy of photons of incident light
A.
the emitted electrons have energy less than a maximum value of energy depending upon frequency of incident radiations
A metal surface is exposed to solar radiations ,the emitted electrons have energy less than maximum value of energy depending upon freauency of incident radiations .
Orbital is :
circular path around the nucleus in which the electrons revolves
space around the nucleus where the probability of finding the electron is maximum
amplitude of electron wave
none of the above
Which of the following sequence is correct as per Aufbau principle ?
3s < 3d < 4s < 4p
ls < 2p < 4s < 3d
2s < 5s < 4p < 5d
2s < 5s < 4p < 5f