Since every object has some temperature, every object radiates energy. Why, then, can’t we see objects in the dark?

Q: 00s 000E + 0osz 0007 + 000L + 006 008 Infrared 004 009 Ultraviolet A measure of the intensity…

A: 9) The curve peak intensity appears at a wavelength around 1500 nm, which is in the infrared region…

Q: Why is photoelectric emission not possible at all frequencies?

A: Given:-   Photoelectric emission not possible at all frequencies explain:-  Photoelectric emission…

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: As an object is heated, the peak in its thermal emission spectrum may shift out of the visible part…

A: According to Wien's displacement law λT=a constant

Q: What does it mean if it is stated that an object radiates blackbody radiation?

A: If an object is absorbing all the radiation falling on it then body is known as blackbody.

Q: Suppose you are working with a photosensitive material that you know is sensitive to green light,…

A: Required : Which light is will damage the material.

Q: 5.3 The surface temperature of the Sun is 5800 K about and measurements of the Sun's spectral…

A:

Q: not an application of photoelec O a. in chromatiser O b. in television camera O c. in solar…

A: Option a ) Chromatiser   Photoelectric effect s not used in chromatiser  In chromatiser adsorption…

Q: The higher the energy of a photon, the ____ its wavelength. Longer Shorter Cannot tell

A:

Q: Calculate the momentum of a photon of yellow light of wavelength 5.80 x10-7m

A: wavelength = 5.80 x10-7m

Q: A photon of wavelength of 4.3408 X 10-7 meter enters a hydrogen atom whose electron is sitting at…

A: Given: The wavelength of the photon is 4.3408x10-7 m. The initial state of the electron is 2.

Q: A γ-ray photon has a momentum of 8.5 × 10-21 kg⋅m/s.  wavelength is 7.795E-14. Calculate its energy…

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: The wavelength of a photon determines its (select two answers) Brightness Speed Color Energy

A: Solution

Q: Who was the first person to obtain the spectrum of sunlight?

A: In 1666, Sir Issac Newton performed prism experiment to obtain the spectrum of sunlight. In his…

Q: Just like the optical part of the spectrum, radio waves can be described in terms of photons -…

A:

Q: How do the surface temperatures of reddish, bluish, and whitish stars compare?

A:

Q: A high-pressure gaseous object (e.g. the sun) will emit a consisting a wide range of wavelengths. *…

A: Given:  A high pressure gaseous object like sun A band of of waves which is in increasing or the…

Q: Which of the statement describes about "Ultraviolet Catastrophe"? A. Rayleigh-Jeans wavelength B.…

A: The ultraviolet catastrophe, also called the Rayleigh–Jeans catastrophe It was the prediction of…

Q: What ate the units of planck's constant

A:

Q: Why won’t a very bright beam of red light impart more energy to an ejected electron than a feeble…

A: Violet has more frequency than red .Energy of electromagnetic radiation is directly proportional to…

Q: What happens to an electron when it emits a photon?

A: When an electron jumps from one energy level to another energy level which is lower than the…

Q: Which has the lower energy quanta—red light or blue light? Radio waves or X-rays?

A: Energy quanta of a monochromatic beam of light is given as,

Q: In what part of the EM spectrum would a photon of energy 9.5 ✕ 10−23 J be found

A: Write the expression for the energy of a photon of electromagnetic radiation.

Q: Why does a fireplace poker appear black when not in the fire and red, yellow, or white when left in…

A:

Q: Ultraviolet light causes sunburn whereas visible light even of greater intensity, does not? Why is…

A: Ultraviolet radiation is the main cause of sunburns. They can change the DNA in skin cells directly.…

Q: Why was helium discovered in the sun’s spectrum before being observed on Earth? Why was hydrogen…

A: The spectrum from the sun was observed to have a bright yellow line in it and this line was earlier…

Q: What is a photoresist?

A: A unique subset of stimuli-responsive materials that alter in response to light exposure are…

Q: As the temperature of an object increases, the wavelength of the brightest light emitted increases…

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: If you pass sunlight through a spectroscope you will see a(n)______________spectrum which can tell…

A:

Q: A typical wavelength of infrared radiation emitted by your body is 25 mm (2.5 × 10−2 m). Show that…

A:

Q: How is the wavelength of light correlated with its energy content?

A: The energy of light can be expressed as E=hν

Q: Why is light is pure energy?

A: The light is only a packet of energy. The photon is known as the packet of energy and in general the…

Q: We can heat a piece of metal to red-hot and then to white-hot. Can we heat it until the metal glows…

A: Yes, metal can glow blue- hot as temperature of metal increases.

Q: Distinguish between monochromatic light and sunlight.

A: Monochromatic light refers to light waves of same wavelength.

Q: Explain- The Photoelectric Effect ?

A: When a light of a certain frequency incident on the surface of a metal, the electrons get ejected…

Q: What is ultraviolet light?

A:

Q: A photon has a wavelength of 581 nm. What is the energy of the photon (in units of 10-19 Joules)?…

A:

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.