Blackbody & Early Quantum

A hot metal radiates strongly at wavelength 600 nm. What is the temperature of the metal?

• 2138 K

• 4830K

• 4230 K

• 1290 K

The energy produced by green light of wavelength 500 nm is

• 1.00 x 10^-10 J

• 1.10 x 10^-14 J

• 3.98 x 10^-19 J

• 4.42 x 10^-36J

Tags

NGSS.HS-PS4-1

NGSS.HS-PS4-3

A sphere of surface area 2.0 m² and at temperature 800 K is assumed to be a blackbody. What is the power radiated by the sphere?

• 144 kW

• 96 kW

• 46 kW

• 16 kW

Which of the following statements is NOT TRUE concerning a blackbody

• It absorbs radiation of all wavelengths that fall on it

• It is a best emitter radiation

• It's radiation is also known as cavity radiation

• It reflects some radiation that falls on it

A sun of radius 7.0 x 10⁸ m and a surface temperature of 5800 K is assumed to be a blackbody. What is the rate of energy radiated by the sun?

• 3.95 x 10²⁶ W

• 9.90 x 10²⁵ W

• 3.00 x 10¹⁵ W

• 3.14 x 10²⁵ W

Choose the correct statement of an ideal blackbody

• Emits 100% of the light it generates, but cannot absorb its own radiation

• Absorbs half of the light incident upon it and emits half of the radiation it generates

• Absorbs all light incident on it, or emits all of the radiation it generates

• Absorbs 100% of the light incident upon it, but cannot emit light of its own

One of the colours below is associated with the lowest temperature. Which one?

• red

• blue

• green

• orange

For a perfect blackbody, the peak radiation intensity emitted by the body is

• dependent on the radiation that falls on the blackbody

• characteristic of the temperature of the blackbody

• always varying for a given temperature

• the same regardless of the temperature of the blackbody

A light source is found to be emitting electromagnetic radiation with a frequency of 10¹⁵ Hz. Calculate the temperature of the source

• 4560 K

• 6540 K

• 7320 K

• 9660 K

A spherical blackbody of radius 12 cm is maintained at a temperature of 427 ⁰C. Find the power radiated by the blackbody.

• 2463 W

• 3456 W

• 4323 W

• 4664 W