Blackbody Radiation

Q. When an iron rod is heated in a furnace, the colour of the iron rod first turns dull red and on further increase in temperature it changes to bright red to orange, then yellow, progressively white and then finally blue at the elevated temperatures.
This sequence of colours observed on heating an iron rod are in the sequence of __________

1. Increasing wavelength
2. Decreasing wavelength
3. Decreasing frequency
4. None of the above

Q. As the wavelength of the radiation decreases, the intensity of the black body radiations ____________

1. Increases
2. Decreases
3. First increases then decrease
4. First decreases then increase

Q. During blackbody radiation at a constant wavelength, intensity of radiation ___________ with increase in temperature.

1. Decreases
2. Increases
3. Remains same
4. Data insufficient

Q.

Electromagnetic Radiation travels through a vacuum at a speed of __________$\mathrm{m}/\mathrm{s}$.

Q. In a blackbody, the intensity of an emitted radiation depends upon :

1. Pressure
2. Temperature
3. None of the above
4. Volume of substance taken

Q.

What are radiation and its effects?

Q.

What is black body and what are black body radiation

Q. Select the correct statement(s).

1. The ideal body which emits and absorbs all frequencies is called a black body
2. The exact frequency distribution of the emitted radiation from a black body depends upon its temperature
3. In electromagnetic radiation the electric field and magnetic field are oscillating perpendicular to each other and also perpendicular to the direction of propagation.
4. In vacuum, all types of electromagnetic radiations travel at the same speed

Q. Three black bodies are such that maximum intensity wavelength are in the ratio ${\lambda }_{m1}:{\lambda }_{m2}:{\lambda }_{m3}=1:(15{)}^{1/2}:(7{)}^{1/2}$.
Which of the following is true for the temperatures?

1. $T_1>T_2>T_3$
2. $T_3>T_2>T_1$
3. $T_3>T_1>T_2$
4. $T_1>T_3>T_2$

Q. light is electromagnetic wave? if yes whats the reason ?

Q. In a blackbody, the intensity of an emitted radiation depends upon :

1. Pressure
2. Volume of substance taken
3. Temperature
4. None of the above

Q. The velocities of two particles $A$ and $B$ are $0.05$ and $0.02$ $m{s}^{-1}$ respectively. The mass of $B$ is five times the mass of $A$. The ratio of their de-Broglie's wavelength is :

1. $2:1$
2. $1:1$
3. $1:4$
4. $4:1$

Q.

Which of the following explains the particle like nature of light?

1. Interference

2. Diffraction

3. Photoelectric effect

4. Black body Radiation

Q. Three black bodies are such that the maximum intensity of their wavelength are in the ratio ${\lambda }_{m_1}:{\lambda }_{m_2}:{\lambda }_{m_3}=1:(21{)}^{0.5}:(3{)}^{0.5}$.
Which of these is true for their temperature?

1. $T_3>T_2>T_1$
2. $T_1>T_3>T_2$
3. $T_1>T_2>T_3$
4. $T_3>T_1>T_2$

Q. A black body is a perfect absorber and perfect emitter of radiation.

1. True
2. False

Q. Do maximum kinetic theory of the photoelectrons depends on frequency or intensity of incident radiation?
Ch: Dual Nature Of Radiation & Particles

Q. Three black bodies are such that the maximum intensity of their wavelength are in the ratio ${\lambda }_{m_1}:{\lambda }_{m_2}:{\lambda }_{m_3}=1:(21{)}^{0.5}:(3{)}^{0.5}$.
Which of these is true for their temperature?

1. $T_1>T_3>T_2$
2. $T_1>T_2>T_3$
3. $T_3>T_2>T_1$
4. $T_3>T_1>T_2$

Q. In blackbody radiation, which of the following properties changes with increasing temperature.

1. Wavelength of maximum intensity
2. Colour
3. Pressure
4. Both a and b

Q.

Bad absorbers are bad radiators..

1. True
2. False

Q. Define the term 'radiation'.

Q. A black body is a perfect absorber and perfect emitter of radiation.

1. True
2. False

Q. A certain metal when irradiated with light $(\nu =3.2\times {10}^{16}\text{Hz})$ emits photoelectrons with twice kinetic energy of photoelectrons that are emitted when the same metal is irradiated by light $(\nu =2.0\times {10}^{16}\text{Hz})$. Calculate ${\nu }_o$ of electron.

Q. Which of the following statements are correct?

1. Black body is an ideal body which only absorbs radiations of all frequencies.
2. Black body is an ideal body which only emits radiations of all frequencies.
3. Black body is an ideal body which absorbs as well as emit radiations of all frequencies.
4. None of the above

Q. In a blackbody, the intensity of an emitted radiation depends upon :

1. Temperature
2. None of the above
3. Pressure
4. Volume of substance taken

Q. Assertion :Black body is an ideal body that emits and absorbs radiations of all frequencies. Reason: The frequency of radiation emitted by the body goes from a lower frequency to higher frequency with an increases in temperature.

1. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
2. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
3. Assertion is correct but Reason is incorrect
4. Both Assertion and Reason are incorrect

Q. Three black bodies are such that the maximum intensity of their wavelength are in the ratio ${\lambda }_{m_1}:{\lambda }_{m_2}:{\lambda }_{m_3}=1:(21{)}^{0.5}:(3{)}^{0.5}$.
Which of these is true for their temperature?

1. $T_1>T_3>T_2$
2. $T_1>T_2>T_3$
3. $T_3>T_2>T_1$
4. $T_3>T_1>T_2$

Q. The energy of electromagnetic radiation depends on:

1. both A and B
2. temperature of medium
3. its wavelength
4. its amplitude