Q: Which of the following is a correct unit conversion for wavelength?

1 nm = $$1 \times 10$$^{-9}$$ m

Question 1

Which of the following statements best describes the relationship between wavelength ($$\lambda) $$and frequency ($$
u) $$for electromagnetic waves traveling at the speed of light?

Accepted Answer

As wavelength increases, frequency decreases.

Question 2

A photon has a frequency of $$6.0 	imes 10^4$ Hz. What is its wavelength in meters? (Speed of light c = 3.00$$ 	imes $$10^8 m/s)$$

Accepted Answer

$$5.0 	imes 10^3$ m

Question 3

Which phenomenon could NOT be explained by the classical wave theory of light?

Accepted Answer

Photoelectric effect

Question 4

What is the energy (in joules) of a photon with a wavelength of $$0.154 nm$$? (Planck’s constant $$h = 6.63 	imes 10$$^{-34}$$ J·s, c = 3.00$$ 	imes $$10^8 m/s)$$

Accepted Answer

$$1.29 	imes 10$$^{-15}$$ J

Question 5

Which of the following best describes the photoelectric effect?

Accepted Answer

Emission of electrons from a metal surface when exposed to light of sufficient frequency

Question 6

Which equation correctly relates the energy of a photon to its frequency?

Accepted Answer

$$E = h 
u$$

Question 7

A student observes a line spectrum when viewing the light emitted by a hydrogen gas discharge tube. What does this observation indicate about the energy levels in a hydrogen atom?

Accepted Answer

The energy levels are quantized and discrete.

Question 8

Which of the following is NOT a type of electromagnetic radiation?

Accepted Answer

Sound waves

Question 9

If the frequency of electromagnetic radiation is doubled, what happens to its wavelength (assuming the speed of light is constant)?

Accepted Answer

The wavelength is halved.

Question 10

Which of the following best explains why a heated metal emits light as its temperature increases?

Accepted Answer

The energy is emitted in discrete packets called quanta.

Question 11

A radio station broadcasts at a frequency of $$1.0 	imes 10^8$ Hz. What is the wavelength of the radio waves? (c = 3.00$$ 	imes $$10^8 m/s)$$

Accepted Answer

$$3.0 m$$

Question 12

Which property of electromagnetic waves determines the type of electromagnetic radiation (e.g., X-ray, visible, radio)?

Accepted Answer

Wavelength

Question 13

Which of the following is a correct unit conversion for wavelength?

Accepted Answer

1 nm = $$1 	imes 10$$^{-9}$$ m

Question 14

Which of the following statements about the electromagnetic spectrum is TRUE?

Accepted Answer

Gamma rays have shorter wavelengths than visible light.

Question 15

A metal surface is exposed to light of frequency lower than its threshold frequency. What will happen?

Accepted Answer

No electrons will be emitted.

Question 16

Which scientist first proposed that energy is quantized and can be emitted or absorbed only in discrete amounts?

Accepted Answer

Max Planck

Question 17

Which of the following best describes the difference between a continuous spectrum and a line spectrum?

Accepted Answer

A continuous spectrum contains all wavelengths, while a line spectrum contains only specific wavelengths.

Question 18

Which equation would you use to calculate the frequency ($$
u) of $$electromagnetic radiation if you know its wavelength ($$\lambda) $$and the speed of light ($$c$$)?

Accepted Answer

$$
u = \frac{c}{\lambda}$$

Question 19

Which of the following is a real-world application of the photoelectric effect?

Accepted Answer

Solar panels converting sunlight into electricity

Question 20

Which property of light is responsible for the different colors observed in the visible spectrum?

Accepted Answer

Wavelength

Electronic Structure of Atoms: Waves, Electromagnetic Radiation, and Atomic Spectra

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