Blackbody Radiation

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.

Why is a body with large reflectivity a poor emitter?

Q.

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

1. Interference

2. Diffraction

3. Photoelectric effect

4. Black body Radiation

Q.

What is incorrect about electromagnetic radiations?

1. Oscillating electric and magnetic fields are perpendicular to each other

2. Oscillating electric and magnetic fields are perpendicular to the direction of propagation of the wave

3. They require a medium to travel

4. They can travel in vacuum

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

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

Q.

In the properties, can we write this:

Properties of Electromagnetic Radiation

· The oscillating electric and magnetic field produced by the oscillating charged particles are perpendicular to each other and also perpendicular to the direction of propagation of wave.

· Electromagnetic waves do not require any medium. They can move in vacuum.

· There are many types of electromagnetic waves which differ from one another in wavelength (or frequency). These electromagnetic radiations constitute electromagnetic spectrum.

· Different kinds of units are used for the representation of electromagnetic waves.

· Electromagnetic radiations are characterized by the properties − frequency (v) and wave length (λ).

· Electromagnetic waves travel at the speed of 3.0 × 10⁸ m/s, which is the speed of light (denoted by c).

· The relationship between frequency (ν), wavelength (λ), and velocity of light (c) is given by,

c = vλ

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