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WorksheetsBlackbody
Total questions: 20
Worksheet time: 30mins
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
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
An object with surface area of 2.3 m2 is placed in a room temperature of 50 ⁰C. If the object is at 75 ⁰C and emissivity, e = 0.80, calculate the heat loss of the object through radiation
387 W
397 W
687 W
697 W
The human eye is most sensitive to the light with a wavelength, λ = 560 nm. Determine the temperature a blackbody would radiate most intensely at this wavelength.
2536 K
3542 k
4325 K
5338 K
Determine the energy range of photons for the visible spectrum with wavelength range from 410 nm to 750 nm.
2.65 x 10-16 J – 4.9 x 10-16 J
2.65 x 10-19 J – 4.9 x 10-19 J
2.65 x 10-21 J – 4.9 x 10-21 J
2.65 x 10-23 J – 4.9 x 10-23 J
The surface of the sun can be treated as a blackbody of temperature about 5800 K. What is the peak-intensity wavelength, λm?
5.0 x 10-3 m
5.0 x 10-5 m
5.0 x 10-7 m
5.0 x 10-9 m
A student had a skin temperature of 33 ˚C and was in a room where the walls were at 29 ˚C. If the emissivity is 1 and the body surface area is 1.5 m2, determine the rate of heat loss due to radiation.
38 w
42 w
48 w
52 w
Cauculate the deBroglie wavelength of a 0.05 g projectile fired at 180 ms-1
2.4 x 10-27 m
1.8 x 10-30 m
7.4 x 10-32 m
7.4 x 10-35 m
Choose the correct statement for photon
Photon is a quantum of electromagnetic wave
Photon is a particle with a positive charge
Photon is a particle with a negative charge
Photon is the electron produced when light is incident on a metal's surface
Identify the physical phenomena that cannot be described by the wave theory of light
Diffraction
Polarization
Interference
Photoelectric effect
An electron has a deBroglie's wavelength of 2.9 x 10-3 m. Find its speed.
2.3 x 10-3 ms-1
2.5 x 10-1 ms-1
1.4 x 10-4 ms-1
1.6 x 10-3 ms-1
What happens to the deBroglie's wavelength of an electron if its momentum is doubled?
The wavelength decreases by a factor of 2
The wavelength increases by a factor of 2
The wavelength decreases by a factor of 3
The wavelength decreases by a factor of 4
