Advertisements
Advertisements
प्रश्न
If NRed and NBlue are the numbers of photons emitted by the respective sources of equal power and equal dimensions in unit time, then ______.
विकल्प
NRed < NBlue
NRed = NBlue
NRed > NBlue
NRed ≈ NBlue
Advertisements
उत्तर
If NRed and NBlue are the numbers of photons emitted by the respective sources of equal power and equal dimensions in unit time, then NRed > NBlue.
Explanation:
Photons emitted in a unit of time with the same power and dimensions will have the same energy. Because blue light has more frequency than red light, its energy is greater than red light's. Therefore, the required number of blue photons to emit the same energy is less than the required number of red photons.
APPEARS IN
संबंधित प्रश्न
A photocell is used to automatically switch on the street lights in the evening when the sunlight is low in intensity. Thus it has to work with visible light. The material of the cathode of the photocell is ______.
Choose the correct option.
The equation E = pc is valid ______.
The work function of a metal is 4.2 eV. Its threshold wavelength will be ______.
Ultraviolet radiation of 6.2 eV falls on an aluminum surface (work function 4.2 eV). The kinetic energy in joules of the fastest electron emitted is ______
Define threshold frequency.
What is mean by the dual nature of matter?
In what year did Hertz perform experiments on the generation and detection of electromagnetic waves?
Which experiments led to important discoveries in atomic structure?
Where did a fluorescent glow appear during electric discharge through low-pressure gas?
What were the rays attributed to radiation originating from the cathode called?
Who discovered cathode rays in 1870?
What did Crookes suggest in 1879 about cathode rays?
Which British physicist confirmed that cathode rays consisted of fast-moving negatively charged particles?
What value is given for the speed of light?
What is the presently accepted value of the specific charge \[e/m\] for cathode ray particles?
How did the value of \[e/m\] depend on the gas introduced in the discharge tube?
What did the independence of \[e/m\] from cathode material and gas suggest?
What happened when certain metals were irradiated with ultraviolet light, as found in 1887?
Who performed the oil-drop experiment in 1913 for the precise measurement of the charge on an electron?
What value was measured for the elementary charge?
Which measured values could be used to determine the mass \[m\] of the electron?
