Grade 10 igcse physics

Sound waves of frequency 2.0kHz travel through a substance at a speed of 800m/s. What is the wavelength of the waves?

• 0.40m

• 2.5m

• 400m

• 1600m

The frequency of a wave is doubled. The speed of the wave does not change. What happens to the wavelength of the wave?

• It becomes four times as large.

• It does not change.

• It doubles.

• It halves.

What is the number of wavefronts per second that pass a fixed point?

• the amplitude of the wave

• the frequency of the wave

• the speed of the wave

• the wavelength of thewave

What is the frequency of a wave?

• the distance that a wavefront travels every second

• the distance from one wavefront to the next

• the number of wavefronts produced per second

• the time taken for a wavefront to pass a certain point

Light enters a glass block at an angle of incidence of 46°. The light refracts at an angle of refraction of 26°. What is the refractive index of the glass?

• 0.57

• 0.61

• 1.64

• 1.77

A plane mirror is fitted to a wall. Which statement about the image formed by the mirror is correct?

• The image is real.

• The image is left to right (laterally inverted).

• The image is smaller than the object.

• The image is upside down.

Which group contains only electromagnetic waves?

• light waves, radio waves, γ-rays

• light waves, radio waves, sound waves

• light waves, sound waves, γ-rays

• radio waves, sound waves, γ-rays

How do infra-red waves differ from ultraviolet waves?

• Infra-red waves are longitudinal.

• Infra-red waves have a lower speed in vacuo (in a vacuum).

• Infra-red waves have lower frequencies.

• Infra-red waves have smaller wavelengths.

Which list shows electromagnetic waves in order of increasing frequency?

• visible light, X-rays, γ-rays

• visible light, γ-rays, X-rays

• X-rays, γ-rays, visible light

• γ-rays, X-rays, visible light

Which statement about ultraviolet waves is correct?

• They are used in television remote controllers.

• They can be detected by the human eye.

• They travel as longitudinal waves.

• They have the same speed in a vacuum as radio waves.