Physics - 4/8/22

A beam of light has a wavelength of 600 nm in air. What is the frequency of the light (c = 3x10⁸ m/s)?

• 5 x 10¹⁴ Hz

• 2 x 10¹⁴ Hz

• 3 x 10¹⁴ Hz

• 6 x 10¹⁴ Hz

Find the frequency of an electromagnetic wave with a wavelength 2.75 × 10^–8 m.

• 1.10 Hz

• 1.09 × 10¹⁶ Hz

• 9.17 × 10¹⁵ Hz

• 9.17 × 10¹⁶ Hz

Which of the following electromagnetic waves travels the fastest?

• gamma rays

• radio waves

• ultraviolet waves

• they all travel the same speed

Mr. H catches the news on 780 AM, which broadcasts at 780. kHz. Determine the wavelength of these radio waves.

• 3.85 x 10⁵ m

• 385 m

• 3.85 x 10⁴ m

• 3.85 x 10⁶ m

EM waves are always____________

• Transverse
• Compression
• Longitudinal
• Seismic

The EM spectrum increases from left to right in________________.

• Wavelength
• Frequency
• Amplitude
• Height

Cancer can be treated with_______________waves.

• Penicillin
• Radio
• Infrared
• Gamma

EM waves________________travel through space.

• Never
• Cannot
• Can
• Wish they could

EM waves _______ travel the same speed in a vacuum. 

• never
• sometimes
• always
• can

A common infrared laser operates at 1.06 x 10³ nm. What is the energy of a photon with this wavelength? (1 x 10⁹ nm = 1m)

• 7.02 x 10^-40 J

• 6.25 x 10^-28 J

• 3.54 x 10^-15 J

• 1.87 x 10^-19 J