Question

A sample of a compound is determined to be composed of 4.26 g of Fe and 8.11 g of Cl. If another sample of the same compound has 1.32 g of Fe, how many g of Cl will it have?

Which of the following statements is FALSE?

	Protons and electrons account for most of the mass of the atom
	Neutrons are located in the nucleus of the atom

	Protons are located in the nucleus of the atom
	The volume of the nucleus is very small relative to the volume of the atom

The mass of electrons is very small relative to the mass of the atom

Calculate the wavelength (in nm) of light with a frequency of 5.98 × 10¹⁴ s^-1.

	5.02 × 10-7 nm
	5.02 × 102 nm

	1.99 × 1015 nm
	1.79 × 1032 nm

5.02 × 10-16 nm

Which of the following occurs as the frequency of a photon decreases? (Select all correct answers)

	The energy decreases.
	The wavelength decreases.

	The wavelength increases.
	The energy increases.

	The speed decreases.
	The speed increases.

Answer 1

--> the false statement here is,

The photon and electron account for most of the mass.

But actually mass of electron is very less relative to the mass of photon and neutrons. So, most of the mass occupied by the Photon and Neutrons.

--> speed of light = frequency*wavelength

Wavelength = speed of light/frequency

= (3*10^8)/(5.98*10^14)

= 5.0167 *10^-7 = 501.67 nm

= 5.02*10^2 nm

--> correct options are--

Energy = h*frequency, energy is directly proportional to frequency so as frequency decrease energy will decrease.

c= frequency*wavelength = constant, so frequency and wavelength are inversely proportional hence wavelength increases as frequency decrease.

Speed of photon is constant. It won't change.

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