357794 Monochromatic light of frequency \(6 \times {10^{14}}\;Hz\) is produced by a laser. The power emitted is \(2 \times {10^{ - 3}}\;W.\) How many photons per second on an average, are emitted by the source ? \(({\text{Given}}\,\,h = 6.63 \times {10^{ - 34}}\;J\,)\)

357795 Assertion :
Work function of copper is greater than the work function of sodium, but both have same value of threshold frequency and threshold wavelength.
Reason :
The frequency is inversely proportional to wavelength.

357796 Which of the following phenomena does not explain by wave nature of light?
(I) reflection
(II) diffraction
(III) photoelectric effect
(IV) interference
(V) polarization
Choose the most appropriate answer from the options given below.

357797 Assertion :
Photoelectric effect can take place only with an electron bound in the atom.
Reason :
Electron is a fermion, whereas proton is boson.

357794 Monochromatic light of frequency \(6 \times {10^{14}}\;Hz\) is produced by a laser. The power emitted is \(2 \times {10^{ - 3}}\;W.\) How many photons per second on an average, are emitted by the source ? \(({\text{Given}}\,\,h = 6.63 \times {10^{ - 34}}\;J\,)\)

357795 Assertion :
Work function of copper is greater than the work function of sodium, but both have same value of threshold frequency and threshold wavelength.
Reason :
The frequency is inversely proportional to wavelength.

357796 Which of the following phenomena does not explain by wave nature of light?
(I) reflection
(II) diffraction
(III) photoelectric effect
(IV) interference
(V) polarization
Choose the most appropriate answer from the options given below.

357797 Assertion :
Photoelectric effect can take place only with an electron bound in the atom.
Reason :
Electron is a fermion, whereas proton is boson.

357794 Monochromatic light of frequency \(6 \times {10^{14}}\;Hz\) is produced by a laser. The power emitted is \(2 \times {10^{ - 3}}\;W.\) How many photons per second on an average, are emitted by the source ? \(({\text{Given}}\,\,h = 6.63 \times {10^{ - 34}}\;J\,)\)

357795 Assertion :
Work function of copper is greater than the work function of sodium, but both have same value of threshold frequency and threshold wavelength.
Reason :
The frequency is inversely proportional to wavelength.

357796 Which of the following phenomena does not explain by wave nature of light?
(I) reflection
(II) diffraction
(III) photoelectric effect
(IV) interference
(V) polarization
Choose the most appropriate answer from the options given below.

357797 Assertion :
Photoelectric effect can take place only with an electron bound in the atom.
Reason :
Electron is a fermion, whereas proton is boson.

357794 Monochromatic light of frequency \(6 \times {10^{14}}\;Hz\) is produced by a laser. The power emitted is \(2 \times {10^{ - 3}}\;W.\) How many photons per second on an average, are emitted by the source ? \(({\text{Given}}\,\,h = 6.63 \times {10^{ - 34}}\;J\,)\)

357795 Assertion :
Work function of copper is greater than the work function of sodium, but both have same value of threshold frequency and threshold wavelength.
Reason :
The frequency is inversely proportional to wavelength.

357796 Which of the following phenomena does not explain by wave nature of light?
(I) reflection
(II) diffraction
(III) photoelectric effect
(IV) interference
(V) polarization
Choose the most appropriate answer from the options given below.

357797 Assertion :
Photoelectric effect can take place only with an electron bound in the atom.
Reason :
Electron is a fermion, whereas proton is boson.