Electromagnetic spectrum and dispersion of light

Question 1 of 10

A pure spectrum is obtained by

Question 2 of 10

An electromagnetic wave has a frequency of 1 × 10⁸ Hz. Find its wavelength. (c = 3 × 10⁸ m/s)

Question 3 of 10

X-rays have a longer wavelength than radio waves.

Question 4 of 10

An electromagnetic wave has a frequency of 1 × 10⁶ Hz. Find its wavelength. (c = 3 × 10⁸ m/s)

Question 5 of 10

Explain the appearance of (a) a red rose in white light, (b) a red rose in green light, (c) a white shirt in blue light, (d) a yellow cloth in red light.

Question 6 of 10

All electromagnetic waves travel in a vacuum at

Question 7 of 10

The electromagnetic waves with the highest frequency are

Question 8 of 10

Ultraviolet radiation is used to detect forged bank notes.

Question 9 of 10

An electromagnetic wave has a frequency of 6 × 10¹⁴ Hz. Find its wavelength. (c = 3 × 10⁸ m/s)

Question 10 of 10

An electromagnetic wave has a frequency of 3 × 10¹⁸ Hz. Find its wavelength. (c = 3 × 10⁸ m/s)