Q1. A theta wave is a type of________. Q2. An e.m. wave exerts pressure on the surface on which it is incident.

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Q1. A theta wave is a type of ________.

(a) brain wave associated with critical thinking

(b) brain wave associated with sleep spindles low frequency

(c) high amplitude brain wave low frequency

(d) low frequency, low amplitude brain wave

Correct answer is (d) low frequency, low amplitude brain wave

A theta wave is a type of low frequency, low amplitude brain wave.

Q2. An e.m. wave exerts pressure on the surface on which it is incident. Justify.

Answer

An e.m. wave carries momentum with itself and is given by

P = Energy of wave(U)/ Speed of the wave(c)

= U/c

when it is incident upon a surface it exerts pressure on it.

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