Waves

What is the frequency of a radio wave of wavelength 1.5 km?

• 200 kHz

• 20 kHz

• 450 kHz

• 450 MHz

What is the wavelength of microwave radiation with frequency 10 GHz

• 3 m

• 0.03 m

• 33 m

• 0.33 m

Which of the following statements about an image in a plane mirror is incorrect?

• The image is laterally inverted

• The image is the same distance behind the mirror as the object is in front of it

• The image is real

• The image is the same size as the object

Which of the following statements is incorrect?

• The angle of incidence is equal to the angle of reflection

• The normal is perpendicular to the surface of the mirror

• Increasing the angle of incidence increases the angle of reflection

• The normal, incident ray, and reflected ray lie in different planes

What is the refractive index of plastic if it slows the speed of light to 240 million m/s?

What is the angle of refraction in a glass block of refractive index 1.52 if the angle of incidence is 32 degrees

What is the unit of wavelength?

What is the unit of frequency?

• m

• Hz

• s

• C

Which of the following increases the volume of a sound when increased in magnitude?

• amplitude

• wavelength

• frequency

• speed

What is the velocity of a sound wave of frequency 20 kHz and wavelength 75 mm?

• 150 000 mm/s

• 267 m/s

• 1500 m/s

• 15 mm/s