The Photon Model

Q. Planck's constant has the dimensions of :

1. angular momentum
2. linear momentum
3. force
4. energy

Q. The spectrum of radiation $1.0\times {10}^{14}Hz$ is in the infrared region. The energy of one photon of this in joules will be

1. $\frac{6.62}{3}\times {10}^{-28}$
2. $6.62\times {10}^{-48}$
3. $6.62\times {10}^{-20}$
4. $3\times 6.62\times {10}^{-28}$

Q. Light of two different frequencies whose photons have energies 1eVand 2.5 eVrespectively, successively illuminates a metal of work function 0.5eV. The ratio of maximum kinetic energy of the emitted electron will be

1. 1 : 4
2. 1 : 2
3. 1 : 1
4. 1 : 5

Q. When yellow light is incident on a surface, no electrons are emitted while green light can emit. If red light is incident on the surface then

1. No electrons are emitted
2. Electrons of lower energy are emitted
3. Electrons of higher energy are emitted
4. Photons are emitted

Q. What is the momentum of photon of energy 3 MeV in $kgm{s}^{-1}$?

1. $9\times {10}^{-21}$
2. $1.6\times {10}^{-21}$
3. $9\times {10}^{-28}$
4. $3\times {10}^{-28}$

Q. The work function of a substance is 4.0 eV. The longest wavelength of light that can cause photoelectron emission from this substance is approximately

1. 540 nm
2. 310 nm
3. 220 nm
4. 400 nm

Q. Energy (E) and frequency (v) of a photon is correctly represented by

1. 
2. 
3. 
4. 

Q. Photo-energy 6 eV are incident on a surface of work function 2.1 eV. What is the stopping potential

1. -1.9 V
2. -5 V
3. -3.9 V
4. -8.1 V

Q. Light of frequency $8\times {10}^{15}Hz$ is incident on a substance of photoelectric work function 6.125 eV. The maximum kinetic energy of the emitted photoelectrons is

1. 17 eV
2. 27 eV
3. 37 eV
4. 22 eV

Q. The lowest frequency of light that will cause the emission of photoelectrons from the surface of a metal (for which work function is 1.65 eV) will be

1. $4\times {10}^{10}Hz$
2. $4\times {10}^{11}Hz$
3. $4\times {10}^{14}Hz$
4. $4\times {10}^{12}Hz$