If we continue heating a piece of initially room-temperature metal in a dark room, it will begin to glow visibly. What will be its first visible color, and why?

Q: p glows red because

A: A neon lamp glows red because

Q: How many watts will radiated from a spherical black body 15cm in diameter at a temperature of 600…

A: Answer :-  the surface area of the spherical body         A = 4πR2          A = 4 × 3.14 × ( .075 )2…

Q: If a complex absorbs light at 610 nm, what color would you expect the complex to be?

A: wavelength =610 nm

Q: A LED household bulb is marked with a colour temperature of 3499 K, calculate the peak wavelength…

A: Given data: Color temperature of LED bulb is, T=3499 K.

Q: Which of the following statements regarding Raman spectroscopy are correct? Select 4 of the 6…

A: Raman spectroscopy relies on the principle of inelastic scattering of Photons, also known as Raman…

Q: Line spectra with well-defined wavelengths are emitted by elements in the gaseous state. Hot solid…

A: Given : Line spectra with well-defined wavelengths are emitted by elements in the gaseous state. Hot…

Q: If atoms of a substance absorb ultraviolet light and emit red light, what becomes of the missing…

A: The missing energy may become light of other colors or invisible infrared light.

Q: We know that an incandescent lamp filament at 2500 K radiates white light. Does the lamp filament…

A: A lamp filament will emit radiation energy at all temperatures higher than absolute zero. The peak…

Q: In what way is a piano an example of a quantized system?

A: The term quantized refers to the quality of being restricted to a discrete set of values or steps  A…

Q: Based on the text you read, showing that electrons can behave like waves?

A:

Q: Why does a sample such as hydrogen have 4 discrete lines of color instead of a blurry, continuous…

A:

Q: What can be said about the relative temperatures of whitish-yellow, reddish, and bluish stars?…

A: Bluish stars are the hottest among the stars.

Q: Calculate the difference in energy (in joules) between a photon with λ = 680 nm (red) and a photon…

A: Photon energy is the energy carried by a single photon. The amount of energy is directly…

Q: All objects radiate energy. Why, then, are we not able to see all the objects in a dark room?

A: All the objects emit electromagnetic radiation. Our eyes can see visible lights only, which have…

Q: At rest hydrogen has a spectrum line at 143nm if this line is observed at 138nm for the star Sirius,…

A:

Q: Is it necessary that that every black coloured objects should be considered a blackbody?

A: A perfect black body is a body that absorbs all the radiation that falls on it.

Q: Approximately what percentage of the initial fluorescence intensity remains after 3 lifetimes 5% 13…

A: Given:

Q: The blackbody radiation emitted from a furnace peaks at a wavelength of 2.7  10-6 m (0.0000027 m).…

A:

Q: What Is The Schwinger Effect?

A: In a constant electric field of sufficiently high magnitude, electron pairs are created out of a…

Q: Why does a sodium street lamp give off a different color light than a neon light?

A: Sodium street lamp gives off yellow color, while a neon light gives of a red color.

Q: Neon works in two wavelengths, how do we control it and make it work in one wavelength?

A: Real neon lights consist of  glass tube filled with a small amount (low pressure) of neon gas. Neon…

Q: Why at night, under the mercury or sodium vapor lights in a mall parking lot, do cars seem to be…

A: Color rendering index (CRI):It is defined as the measurement of the ability of light source to…

Q: A laser produces light having wavelength 6.6E-7 m.    How much energy (in Joules)  is carried by one…

A:

Q: In the helium neon laser find the energy difference in eV between the two levels involved in the…

A:

Q: During the photoelectric effect, light knocks electrons out of metals. So why don’t the metals in…

A: During the photoelectric effect, light knocks electrons out of metals.

Q: Silver bromide (AgBr) is a light-sensitive substance used in some types of photographic film. To…

A: Photographic crystals are photosensitive. Thus, when light rays of sufficient energy fall on it,…

Q: What is meant by saying charge is quantized?

A: The smallest charge that exist in nature is electron. The value of charge on an electron is…

Q: Why is ultraviolet light , but not infrared light , effective in making certain materials…

A: The materials which absorb the photons of higher energy and re-emit the photons of lower energy are…

Q: What is electron emission?

A:

Q: A very bright source of red light has much more energy than a dim source of blue light, but the red…

A: Red light and blue light

Q: A laser produces light having wavelength 4.8E-7 m.    How much energy (in Joules)  is carried by one…

A: The formula which is used to calculate energy is         E= hc/λ                   where h= planck's…

Q: A sample of Fe, like many materials, expands as it is warmed. What will happen to the size of the…

A: Diffraction Pattern:- Diffraction of light, as it is used to describe light, occurs more explicitly…

Q: A sodium surface is illuminated with light of wavelength of 0.300 micrometer. The work function for…

A: Electromagnetic waves are transverse waves. This implies that they travel in a direction…

Q: Does the light emitted by a neon sign constitute a continuous spectrum or only a few colors? Defend…

A: Given:  neon light

Q: Why can atoms not be seen with a powerful optical microscope?

A: Atoms cant been seen with an optical microscope because the size of the atoms is smaller than the…

Q: What do you mean by x-ray crystallography?

A: X-ray crystallography is an experimental science used to determine the molecular and atomic…

Q: Since every object has some temperature, every object radiates energy. Why, then, can’t we see…

A: Every object radiates energy

Q: How did the ionization of gas by cathode rays prevent H. Hertz from discovering the true character…

A: The experiment of cathode rays should b e done in vacuum.

Wien's displacement law

Students often get confused between Wien's displacement law and Planck's radiation law. Although both are historically related, yet they are conceptually different. Planck's law helps determine the spectrum of a blackbody, while Wien's law determines the relationship between peak wavelength and temperature.