Advertisements
Advertisements
Question
The light from the Sun is found to have a maximum intensity near the wavelength of 470 nm. Assuming the surface of the Sun as a black body, the temperature of the Sun is _____________.
[Wien's constant b = 2 .898 x l0- 3mK]
Options
5800 K
6050 K
6166 K
6500 K
Advertisements
Solution
The light from the Sun is found to have a maximum intensity near the wavelength of 470 nm. Assuming the surface of the Sun as a black body, the temperature of the Sun is 6166 K.
Explanation:
Given: λm= 470nm = 4.70×10−7m b = 2.898×10−3mK
From Wien's displacement law,
Tλm = b
We get, temperature of sun
T = `b/(λ_m)`
∴ T = `(2.898 xx 10^(−3))/(4.70 xx 10^(−7))` = 6166 K
APPEARS IN
RELATED QUESTIONS
Two copper spheres of radii 6 cm and 12 cm respectively are suspended in an evacuated enclosure. Each of them are at a temperature 15°C above the surroundings. The ratio of their rate of loss of heat is.................
- 2:1
- 1:4
- 1:8
- 8:1
The dimensions of emissive power are ______.
Compute the temperature at which the r.m.s. speed of nitrogen molecules is 832 m/s. [Universal gas constant, R = 8320 J/k mole K, molecular weight of nitrogen = 28.]
1000 tiny mercury droplets coalesce to form a bigger drop. In this process, temperature of the drop _______ .
(A) increases
(B) may increase or decrease
(C) decreases
(D) does not change
The kinetic energy per molecule of a gs at temperature T is ________.
(a) `(3/2)RT`
(b) `(3/2)K_BT`
(c) `(2/3) RT`
(d) `(3/2)("RT"/M)`
Why do marine animals live deep inside a lake when the surface of the lake freezes?
The length of a brass rod is found to be less on a hot summer day than on a cold winter day as measured by the same aluminium scale. Can we conclude that brass shrinks on heating?
The density of water at 4°C is supposed to be 1000 kg m–3. Is it same at sea level and at high altitude?
Which of the curves in the following figure represents the relation between Celsius and Fahrenheit temperatures?
A spinning wheel A is brought in contact with another wheel B, initially at rest. Because of the friction at contact, the second wheel also starts spinning. Which of the following energies of the wheel B increases?
(a) Kinetic
(b) Total
(c) Mechanical
(d) Internal
Should a thermometer bulb have large heat capacity or small heat capacity?
When a hot liquid is mixed with a cold liquid, the temperature of the mixture ____________ .
Which of the following pairs of physical quantities may be represented in the same unit?
Two bodies at different temperatures are mixed in a calorimeter. Which of the following quantities remains conserved?
The mechanical equivalent of heat ____________ .
The temperature of a solid object is observed to be constant during a period. In this period
(a) heat may have been supplied to the body
(b) heat may have been extracted from the body
(c) no heat is supplied to the body
(d) no heat is extracted from the body
Heat and work are equivalent. This means, ____________ .
A railway track (made of iron) is laid in winter when the average temperature is 18°C. The track consists of sections of 12.0 m placed one after the other. How much gap should be left between two such sections, so that there is no compression during summer when the maximum temperature rises to 48°C? Coefficient of linear expansion of iron = 11 × 10–6 °C–1.
A circular hole of diameter 2.00 cm is made in an aluminium plate at 0°C. What will be the diameter at 100°C? α for aluminium = 2.3 × 10–5 °C–1.
‘An object contains more heat’- is it a right statement? If not why?
Explain the meaning of heat and work with suitable examples.
Two tumblers of A and B have water at 50°C temperature. If the water from A and B is poured into tumbler C. The temperature of C is ______.
The degree of hotness and coldness of a body is called ______.
The temperature of a liquid drops from 365 K to 361 K in 2 min. Find the time during which the temperature of the liquid drops from 344 K to 342 K.
(Take, room temperature = 293 K)
The average kinetic energy of molecules of a gas is directly related to which physical quantity?
Which of the following correctly differentiates heat from temperature?
